Normal Creatinine but Kidney Damage? 6 Early Signs Routine Tests May Miss

Your serum creatinine report is within the laboratory's normal range.

Does that mean your kidneys are definitely healthy?

Not necessarily.

It is possible to have normal creatinine but kidney damage, particularly during the earlier stages of chronic kidney disease (CKD). Creatinine is an extremely useful blood test, but it is not a direct measurement of kidney health, and looking at the creatinine value alone can miss clinically important abnormalities.

This matters especially in people with diabetes, high blood pressure, obesity, cardiovascular disease, a family history of kidney disease, previous acute kidney injury or other conditions that increase kidney risk.

Early kidney disease is often silent. There may be no pain, no obvious change in urination and no swelling. Serum creatinine may also remain within the laboratory reference range.

For this reason, kidney assessment should not simply ask, “Is creatinine normal?”

A better question is: What is the estimated glomerular filtration rate (eGFR), is albumin leaking into the urine, and is there any other evidence of kidney damage?

Why Normal Creatinine Does Not Always Mean Normal Kidneys

Creatinine is a waste product generated largely from normal muscle metabolism. It enters the bloodstream and is removed predominantly through the kidneys.

When kidney filtration declines substantially, serum creatinine generally rises.

That makes creatinine useful—but the relationship is influenced by several factors.

Normal Creatinine but Kidney Damage Can Occur Because Creatinine Depends on More Than Kidney Function

Serum creatinine is influenced by muscle mass, age, sex, diet and other biological factors in addition to kidney filtration.

A muscular younger adult may naturally produce more creatinine than a frail older adult with very little muscle.

This means that the same creatinine concentration can represent different levels of kidney filtration in different people.

It also means that a creatinine value sitting comfortably inside the laboratory reference interval should not automatically be interpreted as proof of normal kidney function.

Why Looking Only at the Laboratory's Creatinine Range Can Be Misleading

Laboratory reference intervals describe values found within a reference population. They are not personalised kidney-function targets.

Consider an older adult with low muscle mass. Because less creatinine is produced, serum creatinine may remain relatively modest even when kidney filtration has declined significantly.

This is one reason modern kidney assessment generally uses creatinine to estimate GFR rather than interpreting creatinine in isolation.

Creatinine Is Part of the Calculation, Not the Entire Assessment

The estimated glomerular filtration rate, or eGFR, uses serum creatinine together with demographic information to provide an estimate of kidney filtration.

It is still an estimate and has limitations, but it usually provides more clinically meaningful information than asking whether creatinine has crossed the laboratory's upper reference limit.

What Is eGFR?

Glomerular filtration rate describes how effectively the kidneys filter blood through structures called glomeruli.

Directly measuring GFR is possible but is not practical for routine screening in most patients.

Instead, laboratories commonly report an estimated GFR calculated from serum creatinine.

eGFR Helps Reveal Why Normal Creatinine but Kidney Damage Is Possible

A person can have creatinine that appears “normal” on the report while the calculated eGFR is lower than expected.

This can be particularly relevant with increasing age or reduced muscle mass.

However, eGFR also requires careful interpretation. A single mildly reduced value does not automatically establish chronic kidney disease.

Chronicity matters.

What Actually Defines Chronic Kidney Disease?

Chronic kidney disease is not defined simply by having high creatinine.

CKD involves abnormalities of kidney structure or function that persist for at least three months and have implications for health.

Evidence can come from reduced GFR or from markers of kidney damage.

This distinction is crucial because someone may have preserved filtration but already have evidence of kidney injury.

Kidney Damage Can Exist With an eGFR Above 60

For example, persistent albuminuria can indicate kidney damage even when eGFR remains relatively preserved.

This is why checking only serum creatinine can miss early diabetic kidney disease and other forms of CKD.

The combination of eGFR and urine albumin assessment provides a much more informative picture.

The Two Numbers That Deserve Attention: eGFR and UACR

For people at risk of chronic kidney disease, two measurements are particularly useful:

• eGFR: estimates kidney filtration.
• Urine albumin-to-creatinine ratio (UACR): detects abnormal leakage of albumin into the urine.

These measurements assess different aspects of kidney health.

Think of Filtration and Leakage as Different Signals

A kidney can still filter reasonably well while beginning to leak abnormal amounts of albumin.

Conversely, filtration can decline without marked albuminuria in some forms of kidney disease.

This is why relying on either marker alone can provide an incomplete assessment.

Six Early Signs Routine Creatinine Testing May Miss

The following six findings can provide clues to kidney disease even when serum creatinine has not become obviously abnormal.

Some are laboratory findings rather than symptoms, which is precisely why proactive screening is important.

Early Sign 1: Albumin in the Urine

One of the most important early markers of kidney damage is abnormal urinary albumin excretion.

Albumin is an important protein normally found in the bloodstream. Healthy glomeruli largely prevent significant amounts of albumin from leaking into urine.

When the kidney's filtration barrier becomes damaged, albumin leakage may increase.

Urine Albumin Can Become Abnormal Before Creatinine Rises

This is particularly important in diabetes.

A person may have apparently normal serum creatinine and a reasonably preserved eGFR while the urine albumin-to-creatinine ratio is already abnormal.

That is a classic example of normal creatinine but kidney damage.

Why UACR Is More Useful Than Simply Looking for Protein on a Routine Urine Report

A routine urine dipstick can detect larger amounts of protein, but it may miss lower levels of albumin that are clinically important.

UACR is more sensitive for detecting modest increases in urinary albumin excretion.

The test measures albumin relative to urine creatinine, helping account for how concentrated or dilute the urine sample is.

What Do UACR Categories Mean?

An abnormal result should usually be confirmed because albuminuria can fluctuate.

A Single High UACR Does Not Automatically Mean Chronic Kidney Disease

Urinary albumin can increase temporarily.

Potential influences include strenuous exercise, fever, urinary infection, marked hyperglycaemia and some acute illnesses.

For this reason, persistence matters.

Repeat Testing Can Prevent Misdiagnosis

If UACR is unexpectedly elevated, it may need to be repeated under appropriate conditions rather than immediately labelling the patient as having permanent kidney damage.

CKD requires evidence that the abnormality is chronic, generally present for at least three months.

Early Sign 2: A Lower-Than-Expected eGFR Despite “Normal” Creatinine

The second clue is the eGFR itself.

A laboratory may report serum creatinine inside its reference interval while the calculated eGFR reveals reduced filtration.

This discrepancy is not necessarily a laboratory error.

Why Age and Muscle Mass Matter

Consider an older person with relatively little muscle.

Creatinine production may be low. Therefore, a creatinine concentration that does not appear particularly high may still correspond to substantially reduced kidney filtration.

This is why the question “What is my creatinine?” should increasingly be accompanied by “What is my eGFR?”

How Should eGFR Be Interpreted?

*G1 or G2 alone does not establish CKD unless another marker of kidney damage is present.

An eGFR of 75 Does Not Automatically Mean Stage 2 CKD

This is a frequent source of unnecessary anxiety.

An eGFR between 60 and 89 does not by itself diagnose chronic kidney disease.

There must also be evidence of kidney damage—such as persistent albuminuria or certain structural abnormalities—for CKD to be diagnosed in this GFR range.

Clinical context and persistence remain essential.

Early Sign 3: A Progressive Fall in eGFR Over Time

A single kidney test provides a snapshot.

Several tests over time provide a trajectory.

This distinction can be clinically important.

Someone may have eGFR values that remain above a conventional diagnostic threshold but are progressively declining.

The Trend May Matter Even Before the Number Looks Dramatic

For example, an eGFR moving from around 105 to 92 to 78 over several years deserves a different interpretation from an eGFR that has remained stable around 78 for many years.

These numbers should not be interpreted mechanically because normal biological and laboratory variation occurs.

However, a sustained downward trajectory can prompt review of diabetes control, blood pressure, medications, recurrent kidney injury and other potential contributors.

Do Not Diagnose Kidney Decline From Two Slightly Different Results

Creatinine and eGFR fluctuate.

Hydration status, recent illness, medication changes, meat intake, exercise and laboratory variability can influence measurements.

A small change between two reports does not necessarily mean the kidneys are progressively failing.

Look for a Consistent Pattern

Trend interpretation becomes more meaningful when results are compared over months or years under appropriate clinical circumstances.

This is another reason keeping previous laboratory reports can be useful.

Early Sign 4: Persistent High Blood Pressure

Blood pressure and kidney health are closely interconnected.

High blood pressure can damage the kidneys, while kidney disease can also contribute to hypertension.

A person can therefore have normal creatinine but kidney damage while hypertension is already providing an important warning signal.

Blood Pressure Is Both a Cause and a Consequence

Persistently elevated pressure can damage small blood vessels within the kidneys over time.

At the same time, kidney abnormalities can affect sodium handling, fluid balance and hormonal systems involved in blood-pressure regulation.

This relationship is one reason blood pressure control is central to protecting kidney and cardiovascular health.

When High Blood Pressure Should Increase Suspicion

Kidney assessment becomes particularly important when hypertension is:

• Difficult to control despite appropriate treatment.
• Accompanied by diabetes.
• Associated with albuminuria.
• New or unexpectedly severe.
• Accompanied by declining eGFR.

This does not mean every person with hypertension has kidney disease. It means the two conditions should be assessed together.

Early Sign 5: Blood or Other Abnormalities in the Urine

Kidney disease does not always present as reduced filtration or albuminuria.

Blood in the urine, abnormal urinary sediment or other persistent urine abnormalities can sometimes indicate kidney or urinary-tract disease even when creatinine remains normal.

Microscopic Blood May Be Invisible

Haematuria does not always make urine visibly red.

Microscopic haematuria may be detected only during urine testing.

Its causes range from urinary infection and stones to kidney diseases and urological conditions.

Therefore, persistent blood in the urine should not simply be ignored because creatinine is normal.

Not Every Abnormal Urine Test Means Kidney Disease

Urine findings need context.

Menstruation, strenuous exercise, urinary infection and sample contamination can influence results.

Depending on the abnormality, repeat testing or further evaluation may be appropriate.

Visible blood in the urine generally deserves medical assessment even if there is no pain.

Early Sign 6: Structural Kidney Abnormalities on Imaging

Sometimes evidence of kidney disease appears on ultrasound, CT or another imaging study before serum creatinine becomes abnormal.

Examples can include certain structural abnormalities, obstruction, polycystic kidney disease or other anatomical changes.

Normal Creatinine Does Not Rule Out Structural Kidney Disease

The kidneys have substantial functional reserve.

Structural disease can therefore exist while overall filtration remains sufficient to keep serum creatinine within the laboratory reference interval.

This is another important example of why normal creatinine but kidney damage is medically possible.

Why Early Kidney Disease Often Has No Symptoms

Many patients expect kidney disease to cause back pain, reduced urine output or swelling.

Early CKD frequently causes none of these.

The kidneys have considerable reserve capacity, and gradual loss of function may not produce noticeable symptoms until disease becomes more advanced.

You Can Feel Completely Well While Kidney Damage Is Developing

This is why screening matters in high-risk groups.

Waiting for symptoms is not an effective strategy for detecting early diabetic or hypertensive kidney disease.

A person with diabetes can feel well, have normal-looking urine, report normal urine volume and still have persistent albuminuria.

Who Should Pay Particular Attention Even When Creatinine Is Normal?

The possibility of normal creatinine but kidney damage deserves greater attention in people with important kidney risk factors.

These include people with:

• Diabetes.
• High blood pressure.
• Established cardiovascular disease.
• A previous episode of acute kidney injury.
• A family history of kidney disease.
• Known structural urinary or kidney abnormalities.
• Long-term exposure to medicines or substances that may affect kidney function.
• Other medical conditions associated with kidney disease.

For these patients, relying only on an annual serum creatinine value can provide false reassurance.

Diabetes Is a Classic Situation Where Creatinine Alone Is Not Enough

Diabetic kidney disease may begin with abnormal urinary albumin excretion while eGFR remains preserved.

Some people with diabetes can also develop declining kidney function without prominent albuminuria.

This means both urinary albumin and eGFR matter.

“My Creatinine Is Normal” Should Not End Kidney Screening in Diabetes

A person with diabetes may proudly show a creatinine result inside the laboratory range while never having had a urine albumin-to-creatinine ratio checked.

That kidney assessment is incomplete.

The goal of screening is to identify kidney involvement early enough to optimise glucose management, blood pressure, cardiovascular risk and kidney-protective treatment where clinically indicated.

The Most Important Message 

Serum creatinine remains a valuable test. The mistake is not using creatinine—the mistake is using only creatinine.

Early kidney assessment should consider filtration, urine albumin, urine abnormalities, blood pressure, trends over time and relevant structural findings.

That broader approach explains how a patient can have normal creatinine but kidney damage and why early CKD can be missed when a routine health check simply marks creatinine as “normal.”

Urine Albumin Testing: The Test Most Often Missing When Creatinine Is Normal

When someone has diabetes or another important risk factor for chronic kidney disease, checking serum creatinine alone is not enough.

One of the most valuable additional tests is the urine albumin-to-creatinine ratio (UACR).

UACR looks for relatively small amounts of albumin leaking into the urine. This leakage may appear before serum creatinine rises substantially, making it particularly useful when investigating normal creatinine but kidney damage.

Why UACR Can Detect Kidney Damage Before Creatinine Becomes Abnormal

The glomeruli are microscopic filtering structures inside the kidneys. Their filtration barrier normally keeps most albumin within the bloodstream.

When this barrier becomes damaged, more albumin can pass into the urine.

At this stage, the kidneys may still have enough overall filtration capacity to maintain a relatively normal serum creatinine and eGFR.

This creates an important window in which kidney damage may be detectable even though the routine blood report appears reassuring.

Why a Routine Urine Test May Not Be Enough

Many health packages include a routine urine examination. This is useful for detecting several abnormalities, including larger amounts of protein, blood, glucose, cells and signs suggesting urinary infection.

However, a routine dipstick is not the preferred test for detecting lower levels of albuminuria.

A person may therefore have a routine urine report showing “protein: nil” while UACR is abnormal.

Normal Urine Protein Does Not Necessarily Mean Normal UACR

This distinction is particularly important in diabetes and hypertension.

If kidney screening is being performed specifically to look for early kidney involvement, an appropriately collected UACR provides information that a standard urine protein dipstick may miss.

What Does a UACR Result Actually Mean?

UACR is often reported in mg/g. Some laboratories use mg/mmol, so the units should always be checked before interpreting the number.

One Abnormal UACR Should Usually Be Confirmed

Albumin excretion varies from day to day.

Strenuous exercise, fever, urinary infection, marked hyperglycaemia, acute illness and other temporary factors may increase urinary albumin.

Therefore, an isolated abnormal UACR should generally be interpreted in context and confirmed when appropriate before diagnosing persistent albuminuria.

Diabetic Kidney Disease Can Develop With Normal Creatinine

Diabetes is one of the most important clinical situations in which normal creatinine but kidney damage can occur.

Chronically elevated glucose, hypertension and other metabolic factors can damage the renal microvasculature and glomerular filtration barrier over time.

Early in this process, serum creatinine may remain within the laboratory reference range.

Waiting for Creatinine to Rise Can Mean Detecting Disease Later Than Necessary

The purpose of kidney screening in diabetes is not merely to identify advanced renal failure.

It is to detect kidney involvement early enough to intervene on modifiable risk factors and use kidney-protective treatment when clinically appropriate.

This is why contemporary diabetes care evaluates both eGFR and urinary albumin rather than relying solely on serum creatinine.

Can Diabetic Kidney Disease Occur Without Albuminuria?

Yes.

Although albuminuria is an important marker of diabetic kidney disease, not every patient follows the traditional sequence of increasing albumin leakage followed by declining filtration.

Some people with diabetes develop reduced eGFR with little or no albuminuria.

Neither UACR nor eGFR Should Be Used Alone

This reinforces the importance of assessing both.

UACR tells us about albumin leakage.

eGFR estimates filtration.

Together, they provide substantially more information about kidney and cardiovascular risk than either measure in isolation.

Kidney Risk Depends on Both eGFR and Albuminuria

CKD classification does not stop at assigning someone a G-stage based on eGFR.

Albuminuria category also matters.

A patient with an eGFR of 75 mL/min/1.73 m² and persistent UACR of 250 mg/g has a different risk profile from someone with the same eGFR and UACR below 30 mg/g.

A “Good” eGFR Does Not Cancel Significant Albuminuria

This is another reason normal creatinine but kidney damage deserves attention.

Preserved filtration should not create false reassurance when persistent albuminuria is present.

Does Foamy Urine Mean Protein Is Leaking From the Kidneys?

Patients frequently notice bubbles or foam in the toilet and become worried about kidney disease.

Persistent proteinuria can sometimes cause noticeably foamy urine, but appearance alone is not a reliable diagnostic test.

Urine may appear bubbly because of a forceful urinary stream, concentrated urine, toilet-cleaning chemicals or other benign reasons.

Do Not Diagnose Proteinuria by Looking at the Toilet Bowl

If persistent protein leakage is a concern, test the urine.

Similarly, the absence of visible foam does not rule out albuminuria.

Early albumin leakage is often completely invisible.

Can You Have Kidney Disease Without Swelling?

Yes.

Swelling of the ankles, feet or around the eyes can occur in some kidney disorders, particularly when sodium and fluid handling become impaired or urinary protein loss becomes substantial.

But early CKD often produces no swelling at all.

Waiting for Swelling Can Delay Detection

Someone with early diabetic kidney disease may feel completely normal and have no swelling, pain or noticeable urinary change.

That is precisely why laboratory screening is necessary in people at increased risk.

Why Muscle Mass Can Make Creatinine Misleading

Creatinine is generated largely from muscle metabolism.

Therefore, the amount of muscle a person carries affects the serum creatinine concentration.

This becomes clinically important at both extremes of muscle mass.

Low Muscle Mass Can Hide Reduced Kidney Function

An older adult, a frail person or someone who has experienced substantial muscle loss may produce relatively little creatinine.

Serum creatinine can therefore look reassuring despite impaired filtration.

This is a particularly important limitation when evaluating normal creatinine but kidney damage in older adults or people with sarcopenia.

Very Muscular People Can Have the Opposite Problem

A muscular person may naturally produce more creatinine.

This can make creatinine-based eGFR appear lower than the person's true filtration in some situations.

Recent meat intake and creatine supplementation may also influence serum creatinine.

Creatinine Needs Clinical Context

A creatinine value should therefore never be interpreted as an isolated number without considering age, body composition, medications, diet and previous results.

What Is Cystatin C?

Cystatin C is another blood marker that can be used to estimate kidney filtration.

Unlike creatinine, it is much less dependent on skeletal muscle mass.

This can make it useful when creatinine-based eGFR may be inaccurate or when greater precision would change clinical decision-making.

Cystatin C Can Help Clarify an Uncertain eGFR

In selected patients, combining creatinine and cystatin C can improve the accuracy of estimated GFR compared with relying on either marker alone.

This may be particularly useful when muscle mass is unusually low or high or when an eGFR estimate lies near a threshold that would affect diagnosis, medication dosing or other clinical decisions.

Should Everyone Get a Cystatin C Test?

No.

Creatinine-based eGFR remains appropriate for routine kidney assessment in most people.

Cystatin C is an additional tool rather than a universal replacement for creatinine.

Its interpretation also has limitations because factors other than GFR can influence cystatin C.

Use the Test When It Will Answer a Clinical Question

Testing should be targeted rather than simply adding every available biomarker to an annual health package.

Can Dehydration Increase Creatinine?

Yes. Significant volume depletion can reduce kidney perfusion and may cause creatinine to rise.

Vomiting, diarrhoea, fever, inadequate fluid intake and excessive fluid loss can all contribute in appropriate circumstances.

Therefore, an unexpected increase in creatinine during an acute illness should be interpreted differently from a stable abnormality present for months.

One Abnormal Creatinine Does Not Automatically Mean Chronic Kidney Disease

CKD requires chronicity.

A sudden increase in creatinine may instead represent acute kidney injury, which requires assessment of the cause and clinical severity.

Previous laboratory reports are extremely useful for distinguishing a new change from a long-standing abnormality.

Can Creatine Supplements Increase Serum Creatinine?

Creatine supplements are widely used in fitness and sports.

Because creatine can ultimately contribute to creatinine production, supplementation may influence serum creatinine in some people.

This does not automatically mean that the kidneys have been damaged.

Tell Your Doctor About Creatine and Other Supplements

If an unexpected creatinine result is being investigated, supplement use should be disclosed.

The clinician can then interpret the result in context and decide whether repeat testing, cystatin C or another assessment is useful.

Does a High-Protein Diet Damage Healthy Kidneys?

This question requires nuance.

Protein intake can influence renal haemodynamics, and very high-protein diets are not appropriate for everyone, particularly people with established CKD who may require individualised nutritional advice.

However, normal dietary protein intake should not automatically be blamed for kidney disease in a person with otherwise healthy kidneys.

People With CKD Should Avoid Copying High-Protein Fitness Diets Without Individualisation

Protein requirements vary according to kidney function, albuminuria, nutritional status, age, physical activity, diabetes, dialysis status and other clinical factors.

A person with CKD should therefore not automatically adopt a bodybuilding-style high-protein diet simply because it is popular online.

At the same time, excessively restricting protein without medical or dietetic guidance can contribute to poor nutrition and muscle loss.

NSAID Painkillers and Kidney Risk

Non-steroidal anti-inflammatory drugs (NSAIDs) are widely used for headache, back pain, arthritis, sports injuries and other painful conditions.

These medicines can reduce prostaglandin-mediated blood flow within the kidneys and may precipitate acute kidney injury in susceptible individuals.

Risk Is Higher in Certain Situations

Greater caution is needed in people with CKD, dehydration, heart failure, older age or certain combinations of blood-pressure and diuretic medicines.

Occasional medically appropriate use and repeated unsupervised use are not the same thing.

People with kidney disease should discuss suitable pain-relief options with their clinician rather than repeatedly self-medicating.

Some Kidney-Protective Medicines Can Initially Change Creatinine

This is another area where patients can become unnecessarily worried.

ACE inhibitors and angiotensin receptor blockers (ARBs) alter pressure within the kidney's glomeruli. A modest early change in creatinine or eGFR may occur after initiation or dose adjustment.

This does not automatically mean the medicine is damaging the kidneys.

Do Not Stop ACE Inhibitors or ARBs Simply Because Creatinine Changes Slightly

These medicines can be kidney protective in appropriately selected patients, particularly when albuminuria is present.

Clinicians typically assess the magnitude of the creatinine change, potassium level, blood pressure, volume status and other factors.

A larger-than-expected deterioration requires evaluation, but patients should not discontinue prescribed treatment on their own.

SGLT2 Inhibitors and the Early eGFR Dip

SGLT2 inhibitors have become important kidney- and cardiovascular-protective medicines in appropriately selected people with diabetes, CKD and heart failure.

After starting treatment, a small early fall in eGFR can occur because of changes in intraglomerular haemodynamics.

This early dip is different from progressive kidney injury.

Kidney Protection Can Coexist With a Small Initial eGFR Change

Over the longer term, SGLT2 inhibitors can slow CKD progression in appropriate patients.

This is an excellent example of why kidney numbers must be interpreted physiologically rather than simply categorising every increase in creatinine as “kidney damage.”

Which Tests Should Be Included in a Practical Kidney Assessment?

Not every person requires an extensive nephrology work-up.

For someone with diabetes, hypertension or another meaningful CKD risk factor, a practical initial assessment commonly includes more than serum creatinine alone.

Does Everyone Need a Kidney Ultrasound?

No.

Ultrasound is useful when there is a clinical reason to look for structural disease—for example, suspected obstruction, recurrent stones, certain urinary abnormalities, unusual decline in kidney function or known structural conditions.

It is not automatically required simply because someone has diabetes or one mildly abnormal laboratory result.

Testing Should Follow the Clinical Question

The aim is not to order every available investigation.

The aim is to detect clinically meaningful kidney disease efficiently and then investigate further when the pattern requires it.

Why Blood Pressure, Diabetes and Kidney Health Should Be Managed Together

Kidney disease rarely exists in isolation from cardiovascular and metabolic health.

Diabetes and hypertension are major drivers of CKD, while CKD itself substantially increases cardiovascular risk.

Obesity, smoking, dyslipidaemia, physical inactivity and poor dietary patterns can further contribute to the overall risk environment.

Protecting the Kidneys Means More Than Watching Creatinine

Effective prevention and treatment may involve:

• Appropriate blood-pressure control.
• Individualised glucose management.
• Reducing excess body weight when indicated.
• Regular physical activity.
• Smoking cessation.
• Avoiding unnecessary nephrotoxic medicines.
• Appropriate sodium intake.
• Kidney-protective medicines when clinically indicated.
• Monitoring eGFR and albuminuria according to individual risk.

This broader approach is much more useful than repeatedly checking serum creatinine while ignoring the conditions driving kidney damage.

Normal Creatinine but Kidney Damage: What Should You Ask at Your Next Health Check?

If you have diabetes, hypertension or another significant CKD risk factor, do not stop after seeing a green tick beside serum creatinine.

Ask:

• What is my eGFR?
• Has my eGFR changed significantly over time?
• Have I had a urine albumin-to-creatinine ratio?
• If UACR is abnormal, has persistence been confirmed?
• Is there blood or another persistent abnormality in my urine?
• Is my blood pressure adequately controlled?
• Could any medicines or supplements be affecting my kidney tests?
• Do my results require repeat testing or further evaluation?

The Goal Is Early Recognition, Not Fear

Finding albuminuria or a reduction in eGFR does not mean kidney failure is inevitable.

It identifies a risk that can be assessed and managed.

Modern CKD management has changed substantially because several interventions can reduce cardiovascular risk and slow progression in appropriately selected patients.

Detecting disease before symptoms appear is therefore valuable.

The Main Lesson From Part 2

Normal creatinine but kidney damage is not an unusual theoretical possibility. It is one of the reasons kidney screening has moved beyond serum creatinine alone.

UACR can reveal albumin leakage while filtration remains preserved. eGFR can reveal impaired filtration even when creatinine appears to sit within the laboratory's reference range. Cystatin C can sometimes clarify uncertain creatinine-based estimates, while urinalysis, blood pressure and imaging provide additional information when clinically indicated.

Equally important, not every creatinine change represents permanent kidney damage. Dehydration, acute illness, muscle mass, supplements and certain medicines can alter creatinine or eGFR.

Good kidney assessment therefore depends on context, trends, urine albumin, filtration and chronicity rather than a single number.

Who Should Be Screened for Kidney Disease Even if Creatinine Is Normal?

Not every healthy adult needs an extensive kidney work-up. However, certain groups have a sufficiently high risk of chronic kidney disease that relying only on serum creatinine is not appropriate.

This is particularly relevant because normal creatinine but kidney damage can occur during the early stages of disease.

Screening becomes especially important in people with diabetes, hypertension, cardiovascular disease, a previous episode of acute kidney injury, known structural kidney disease or a strong family history of CKD.

Diabetes Is One of the Most Important Reasons to Screen Beyond Creatinine

Current diabetes guidance recommends assessing both estimated glomerular filtration rate (eGFR) and urine albumin-to-creatinine ratio (UACR) at least annually in all people with type 2 diabetes and in people with type 1 diabetes once disease duration reaches five years.

For patients who already have chronic kidney disease, monitoring may be needed more frequently depending on the eGFR and albuminuria category.

How Often Should eGFR and UACR Be Checked?

Frequency depends on risk.

Someone with diabetes but no evidence of kidney disease may require annual screening. Once CKD is established, monitoring may range from once yearly to several times per year depending on the stage, albuminuria, rate of progression and treatment changes.

Established CKD Usually Requires More Frequent Monitoring

Current ADA guidance recommends monitoring UACR and eGFR approximately 1–4 times per year in people with established CKD, according to disease stage and risk of progression.

This does not mean every patient needs kidney tests every three months. Testing should be frequent enough to influence management without becoming unnecessary repetition.

Normal Creatinine but Kidney Damage: Why Blood Pressure Control Matters

Blood pressure is one of the most important modifiable factors affecting CKD progression.

Persistent hypertension increases pressure within small renal blood vessels and can accelerate kidney damage. At the same time, kidney disease can make blood pressure more difficult to control.

This creates a cycle in which hypertension and CKD can worsen each other.

Kidney Protection Is Also Cardiovascular Protection

People with CKD have substantially higher cardiovascular risk.

Managing blood pressure therefore protects not only kidney filtration but also reduces the risk of stroke, heart failure and other cardiovascular events.

In people with diabetes, current guidelines generally aim for tight blood-pressure management when it can be achieved safely and individualised appropriately.

ACE Inhibitors and ARBs Can Protect the Kidneys in the Right Patients

ACE inhibitors and angiotensin receptor blockers, or ARBs, are commonly used to treat hypertension.

They have additional kidney-protective benefits in selected patients, particularly when albuminuria is present.

In people with diabetes and hypertension, current guidance recommends an ACE inhibitor or ARB when UACR is 30 mg/g or higher, with stronger recommendations when albuminuria is severe or eGFR is below 60 mL/min/1.73 m².

A Small Creatinine Rise After Starting Treatment Does Not Always Mean Harm

These medicines alter pressure within the glomeruli. A modest initial rise in serum creatinine can occur because of this haemodynamic effect.

Current ADA guidance advises that renin-angiotensin system blockade can generally be continued with a mild-to-moderate creatinine rise of up to approximately 30% when there is no evidence of significant volume depletion.

This is why patients should not stop ACE inhibitors or ARBs on their own simply because a follow-up creatinine value has changed slightly.

SGLT2 Inhibitors Have Changed Kidney Protection in Diabetes

SGLT2 inhibitors were originally introduced as glucose-lowering medicines, but their role has expanded substantially because they can reduce progression of chronic kidney disease and cardiovascular events in appropriately selected patients.

In adults with type 2 diabetes and CKD, current guidance recommends use of an SGLT2 inhibitor or another agent with demonstrated kidney benefit according to kidney function, albuminuria and the broader clinical picture.

The Kidney Benefit Is Not Explained Only by HbA1c Reduction

SGLT2 inhibitors affect intraglomerular haemodynamics and several other renal and cardiovascular pathways.

This is why they can provide kidney benefit even when their glucose-lowering effect becomes smaller at lower eGFR levels.

Again, the choice of medicine should be individualised according to kidney function, diabetes status, cardiovascular disease, blood pressure and other factors.

Normal Creatinine but Kidney Damage: Why Glucose Control Still Matters

Persistent hyperglycaemia can damage the renal microvasculature and contribute to diabetic kidney disease over time.

Good glucose management therefore remains an important part of kidney protection.

However, the goal is not simply to push HbA1c as low as possible.

Glucose Targets Should Be Individualised

Age, duration of diabetes, hypoglycaemia risk, kidney function, cardiovascular disease, medications and overall health all influence the appropriate glucose target.

People with more advanced CKD may also require adjustment of some diabetes medicines because kidney clearance changes.

Can Weight Loss Protect the Kidneys?

When overweight or obesity is present, sustainable weight reduction can improve several factors relevant to kidney health, including blood pressure, glucose regulation, sleep apnoea and insulin resistance.

Excess visceral fat is also associated with cardiometabolic disease and may contribute indirectly to kidney risk.

Do Not Use Extreme Weight-Loss Diets to Protect the Kidneys

Crash diets, dehydration and unnecessary supplement use are not kidney-protection strategies.

A better plan focuses on sustainable fat loss, preservation of muscle, adequate nutrition, regular physical activity and treatment of the metabolic conditions driving kidney risk.

How Much Salt Should Someone With Kidney Risk Eat?

Excess sodium intake can contribute to higher blood pressure and fluid retention, both of which are relevant to CKD.

Reducing very salty foods can therefore support kidney and cardiovascular health.

This often means paying attention not only to table salt but also to packaged snacks, pickles, papad, namkeen, sauces, restaurant meals and highly processed foods.

Lower Sodium Does Not Mean Zero Sodium

Extremely restrictive diets are not automatically better.

Sodium intake should be individualised according to blood pressure, kidney function, heart failure, medications and other medical conditions.

What About Protein Intake in Kidney Disease?

Protein advice is frequently oversimplified.

Some people with CKD may benefit from avoiding very high-protein diets, while others—particularly older adults at risk of muscle loss—can be harmed by excessive restriction.

The appropriate protein intake depends on CKD stage, diabetes, nutritional status, body composition, physical activity and whether the patient is receiving dialysis.

Do Not Copy a Bodybuilding Diet or a Severe Low-Protein Diet

Both extremes can be inappropriate.

People with kidney disease should have protein intake individualised rather than automatically consuming multiple protein shakes or, at the other extreme, drastically restricting protein without clinical guidance.

Hydration and Kidney Health: More Water Is Not Always Better

Dehydration can reduce kidney perfusion and contribute to acute kidney injury, particularly during illness, heat exposure or vomiting and diarrhoea.

However, forcing very large amounts of water does not “wash” the kidneys or reverse CKD.

Hydration Needs Are Individual

Most people should maintain normal hydration according to thirst, climate, activity and medical circumstances.

People with heart failure, advanced CKD or fluid restrictions require individual advice.

Medicines and Supplements Worth Reviewing

When investigating normal creatinine but kidney damage, medication history matters.

Repeated NSAID use, certain herbal preparations, inappropriate supplements and some combinations of prescription medicines can increase kidney risk under particular circumstances.

This does not mean every painkiller or supplement is dangerous. It means kidney risk depends on dose, duration, hydration, underlying kidney function and other medicines.

Tell Your Doctor About Non-Prescription Products

Protein powders, creatine, herbal remedies, over-the-counter painkillers and traditional medicines may not appear on the formal prescription list unless the patient mentions them.

That information can be important when interpreting kidney tests.

When Should Kidney Disease Be Referred to a Nephrologist?

Not everyone with mild CKD needs specialist nephrology care. Many patients can be managed effectively in primary or general medical care.

Referral becomes more important when there is evidence of higher-risk or atypical disease.

Situations That May Need Specialist Assessment

Referral should be considered when there is:

• Rapid or unexplained decline in eGFR.
• Severely increased or rapidly rising albuminuria.
• Persistent active urinary sediment, such as red cells or cellular casts.
• Uncertain cause of kidney disease.
• Advanced reduction in kidney function.
• Difficult-to-control hypertension.
• Recurrent electrolyte abnormalities.
• Suspected hereditary or structural kidney disease.

Current diabetes guidance specifically highlights rapidly declining eGFR, active urine sediment and rapidly increasing or very high UACR as features that may suggest a cause of CKD other than typical diabetic kidney disease and may warrant nephrology evaluation.

Which Kidney Symptoms Need Urgent Medical Attention?

Early CKD is often symptomless, but some situations require prompt evaluation.

Seek urgent medical care for symptoms such as:

• Marked reduction in urine output.
• Sudden significant swelling.
• Severe breathlessness associated with fluid overload.
• Visible blood in the urine.
• Persistent vomiting with dehydration.
• Severe weakness or confusion.
• New severe flank pain with fever.
• Rapid deterioration during an acute illness.

Do Not Wait for Creatinine to Become “Very High” if the Patient Is Unwell

Acute kidney injury can evolve quickly.

Clinical symptoms, urine output, volume status, potassium and other laboratory findings can be more urgent than the absolute creatinine value alone.

Common Myths About Normal Creatinine and Kidney Disease

Myth 1: Normal Creatinine Means the Kidneys Are Definitely Normal

False. Normal creatinine but kidney damage can occur, particularly with albuminuria, reduced eGFR relative to age and body composition, or structural disease.

Myth 2: Kidney Disease Always Causes Pain

False. Early CKD is usually painless.

Myth 3: If Urine Looks Normal, the Kidneys Must Be Healthy

False. Albuminuria can be completely invisible.

Myth 4: Foamy Urine Always Means Kidney Disease

False. Persistent foam can occur with proteinuria, but urine appearance alone is not diagnostic.

Myth 5: eGFR Below 90 Automatically Means CKD

False. G1 and G2 values require another marker of kidney damage before CKD is diagnosed.

Myth 6: Every Small Creatinine Rise Means a Medicine Is Damaging the Kidney

False. ACE inhibitors, ARBs and SGLT2 inhibitors can cause expected haemodynamic changes while providing long-term kidney protection in appropriately selected patients.

Myth 7: Drinking More Water Can Reverse CKD

False. Adequate hydration is important, but excessive water intake does not reverse chronic structural kidney damage.

Myth 8: Protein Should Be Completely Avoided in Kidney Disease

False. Protein needs must be individualised. Excessive restriction can contribute to malnutrition and muscle loss.

A Practical Kidney-Health Checklist

Key Takeaways: Normal Creatinine but Kidney Damage

References

• Kidney Disease: Improving Global Outcomes (KDIGO). 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease.
• American Diabetes Association Professional Practice Committee. Chronic Kidney Disease and Risk Management: Standards of Care in Diabetes—2026.
• American Diabetes Association Professional Practice Committee. Cardiovascular Disease and Risk Management: Standards of Care in Diabetes—2026.
• American Diabetes Association Professional Practice Committee. Pharmacologic Approaches to Glycemic Treatment: Standards of Care in Diabetes—2026.
• Current evidence and clinical guidance regarding albuminuria, creatinine-based and cystatin C-based eGFR, renin-angiotensin system blockade, SGLT2 inhibitors and kidney-protective management in chronic kidney disease.

Written by Dr. Pankaj Kumar , General & Lifestyle Physician, Dwarka, New Delhi