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Creatinine Test

Creatinine is the key marker of kidney function. High creatinine means your kidneys are struggling to filter waste. Here's exactly what your number means.

Written by Suman Konda, Clinical Pharmacist · Based on peer-reviewed sources · Editorial policy · Not medical advice

Last reviewed and updated: · How we check our content

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Quick answer

The creatinine test normal range is 0.74–1.35 mg/dL for men and 0.59–1.04 mg/dL for women. Creatinine is a waste product from muscle metabolism that healthy kidneys filter out. High creatinine means the kidneys are filtering less well, from dehydration, medicines or chronic kidney disease, and is always read alongside eGFR.

What is Creatinine?

Creatinine is a waste product produced by muscle metabolism. Healthy kidneys filter creatinine out of the blood and excrete it in urine. When kidneys are damaged or stressed, creatinine builds up in the blood: causing blood creatinine levels to rise. Creatinine is the most commonly tested kidney marker and is part of the standard KFT (Kidney Function Test) panel.

Creatinine Normal Range

GroupNormal Range (mg/dL)
Men0.74 – 1.35
Women0.59 – 1.04
Children (2–12 yrs)0.3 – 0.7
Elderly (>60 yrs)Slightly lower (less muscle mass)
Creatinine Test: reference intervals by group (mg/dL)A bar for each group showing its reference interval on a shared scale. The same figures appear in the table above.0.190.510.821.141.46Men0.74–1.35Women0.59–1.04Children (2–12 yrs)0.3–0.7mg/dL
Creatinine Test: reference intervals by group (mg/dL), drawn from the table above. Intervals differ between laboratories: compare your result against the range printed on your own report.
Key points
  • Normal creatinine is 0.74-1.35 mg/dL in men and 0.59-1.04 mg/dL in women; children run lower.
  • Creatinine is a waste product of muscle, so muscular people can sit above the range with healthy kidneys while frail or elderly people can have kidney disease with a 'normal' result.
  • High creatinine means the kidneys are filtering less well, from dehydration, medicines or chronic kidney disease; it is always read alongside eGFR.
  • UK labs report in micromoles per litre: divide by 88.4 to convert to mg/dL.
  • A mildly raised creatinine from dehydration usually normalises after fluids; a persistently high one needs investigation.
  • Always compare against the range printed on your own report, since intervals differ between laboratories.

UK Units: Creatinine in µmol/L

UK laboratories report creatinine in µmol/L (micromoles per litre) rather than mg/dL. To convert: divide µmol/L by 88.4 to get mg/dL. A result of 85 µmol/L is equivalent to 0.96 mg/dL.

GroupNormal (µmol/L), UKNormal (mg/dL), US/India
Men59–1040.67–1.18
Women44–800.50–0.90

Reference ranges differ between laboratories: always compare your result against the range printed on your own report, not against figures from a different lab.5

Why a Normal Creatinine Can Still Hide Kidney Trouble

Creatinine is a waste product of muscle. Your muscles produce it continuously at a rate that depends mainly on how much muscle you have, and your kidneys clear it. That makes it a useful marker of kidney function, but it also means the number carries information about your body as well as your kidneys, and the two are easy to confuse.

The consequence is uncomfortable but important. Two people can have identical kidney function and quite different creatinine results simply because one carries more muscle. A muscular young man may sit above the quoted range with entirely healthy kidneys. A frail, elderly or very slight person, or someone who has lost muscle through illness, may produce so little creatinine that their result looks reassuringly normal while their kidneys are working at a fraction of capacity.

The group this misleads most oftenOlder adults with low muscle mass. Their creatinine can sit comfortably inside the reference range while their filtration rate is genuinely reduced. This is precisely why kidney function is reported as an eGFR, which adjusts for age and sex, rather than left as a raw creatinine for you to compare against a range.

When eGFR Itself Is Uncertain

Because eGFR is calculated from creatinine, it inherits creatinine’s dependence on muscle. Estimates built on creatinine alone are imprecise, and that imprecision can push people into a chronic kidney disease label they do not merit.2

There is a second marker, cystatin C, which the body produces largely independently of muscle mass. Combining the two gives a more accurate estimate than either alone. In the study that established the combined equation, the improvement was largest exactly where it matters most, among people whose creatinine-based eGFR sat in the borderline range. Of those with an estimate between 45 and 59, adding cystatin C correctly reclassified about 17% as actually having a filtration rate of 60 or above, meaning they did not have the reduced kidney function the first test implied.2

The ratio between the two markers is itself informative, and is used as an indirect indicator of muscle mass, which is why a discrepancy between them tends to say something about body composition rather than about the kidneys.3

Worth asking aboutIf you have been told your eGFR is borderline, particularly if you are older, have little muscle, are a serious athlete, or the result does not fit how you feel, it is reasonable to ask whether a cystatin C test would clarify it before a chronic kidney disease label is applied. It is a confirmatory test, not a replacement.

Two other things move creatinine without any change in kidney function. A large meat meal raises it for several hours, and heavy exercise shortly before the blood draw does the same. If a single unexpected result is the only abnormality, repeating it under ordinary conditions is often the first sensible step.

What does HIGH creatinine mean?

HIGH Creatinine above 1.4 mg/dL (men) / 1.1 mg/dL (women)

High creatinine (hypercreatininaemia) means the kidneys are not filtering efficiently. Common causes: dehydration (most common, drink more water and retest), chronic kidney disease (CKD from diabetes or hypertension), acute kidney injury (from infection, medication, contrast dye), kidney stones blocking urinary flow, or high muscle mass / high protein diet (minor effect). Always repeat the test after good hydration before concluding kidney disease.

Creatinine above 2.0 mg/dL: Significant kidney impairment

Creatinine above 2 mg/dL usually indicates at least 50% loss of kidney function. Your doctor will calculate eGFR (estimated Glomerular Filtration Rate) which is more accurate than creatinine alone. At this level, kidney ultrasound, urine protein and nephrology referral are typically needed.

What is eGFR and why does it matter more than creatinine?

eGFR: the real measure of kidney function

eGFR (estimated GFR) is calculated from creatinine, age, sex and race. It estimates what percentage of normal kidney function you have. Most labs now report eGFR alongside creatinine.

eGFR (mL/min/1.73m²)CKD StageMeaning
>90G1 (normal)Normal kidney function
60–89G2Mildly reduced
30–59G3Moderately reduced
15–29G4Severely reduced
<15G5Kidney failure: dialysis territory

Questions to ask your doctor

  • Could dehydration explain my high creatinine? Should I retest after drinking more water?
  • What is my eGFR and what stage of CKD does that represent?
  • Should I reduce protein intake or avoid NSAIDs (ibuprofen)?
  • Do I need to see a nephrologist?

How to Lower Creatinine

Whether creatinine can be lowered depends on its cause. Most practical steps target reversible causes rather than the test number itself:

  • Hydration: Dehydration is the most common reversible cause of a raised result. Drinking adequate water and repeating the test after 24–48 hours eliminates dehydration before further investigation.
  • Reduce red meat before the test: A large meal of cooked muscle raises creatinine for several hours. Avoiding heavy meat meals the evening before a planned blood draw gives a more representative baseline.
  • Rest before the test: Heavy exercise breaks down muscle protein and temporarily raises creatinine. Avoiding strenuous training the day before the test removes this source of variation.
  • Avoid creatine supplements: Creatine is metabolised to creatinine. Supplementation can noticeably raise the result independently of kidney function.
  • Review nephrotoxic medicines: NSAIDs (ibuprofen, naproxen), some antibiotics, and contrast agents used in scans can transiently impair filtration. A doctor may pause or adjust them if suspected.

If creatinine remains elevated after these factors are addressed, the cause is likely structural kidney disease requiring clinical investigation rather than lifestyle adjustment.1

Creatinine myths vs facts

Creatinine is the kidney number everyone knows — and the one most often misread. Here is what the evidence actually says:

MYTH A high creatinine always means kidney failure.

Fact: Creatinine also rises with dehydration, heavy muscle mass, a large meat meal and creatine supplements — none of which are kidney failure. Doctors confirm with eGFR, urine tests and repeat values before concluding anything about the kidneys.

MYTH A normal creatinine means the kidneys are fine.

Fact: Creatinine is a late marker: the kidneys can lose substantial function before it rises, especially in older or slightly built people with little muscle. eGFR and urine albumin catch trouble earlier — creatinine alone is not a kidney clean chit.

MYTH Drinking more water fixes high creatinine.

Fact: Hydration corrects the dehydration-driven bump, but it doesn't repair kidney function. If creatinine stays high when well hydrated, the cause needs finding — water is not treatment.

MYTH Creatine supplements are harmless for the kidneys.

Fact: Creatine supplements raise the creatinine number itself (it converts to creatinine), which can mimic kidney trouble on paper. Tell the lab you take creatine so a raised value is read correctly — and discuss long-term use with your doctor.

MYTH Creatinine must be tested fasting.

Fact: A large cooked-meat meal can nudge it, but fasting is not generally required. What matters more is hydration and avoiding heavy exercise just before the draw.

Your creatinine result: what to do next

Got your report and wondering what the number means for you? Find the branch that matches your situation — every path ends with your doctor, because creatinine is never interpreted alone:

If your result is…Sensible next stepTalk to your doctor when…
Mildly raised, first timeRecheck when well hydrated, avoiding heavy exercise and creatine beforehand; review medicines (some raise creatinine).it stays raised on repeat, or eGFR is also reduced.
Raised with low eGFRThis pairing is what defines kidney concern — urine tests and blood pressure review usually follow.promptly; the combination deserves proper evaluation.
Rising trend across reportsBring old reports — the slope matters more than any single value. Check for new medicines or dehydration.the rise is steady or accompanied by swelling, fatigue or reduced urine.
Normal but you have risk factorsDiabetes, hypertension and family history still merit periodic eGFR and urine albumin checks.screening lapses — normal creatinine alone doesn't end kidney surveillance.

Creatinine test price in India

In India, a creatinine test typically costs around &rupee;200–&rupee;400, though prices vary by city and lab. eGFR is calculated from the creatinine value at no extra charge, and the test is usually bundled into kidney function panels. Where possible, choose a NABL-accredited lab, and remember the range printed on your own report is the one that counts.

Frequently Asked Questions

What is worth asking a doctor about an abnormal Creatinine?
Whether the result fits with muscle mass and hydration rather than kidney function alone, since a muscular or dehydrated person can run a higher creatinine without a lower eGFR, and whether a medicine such as trimethoprim or cimetidine is blocking creatinine's tubular secretion without truly changing GFR.
Is a slightly abnormal Creatinine a reason to worry?
A mildly elevated creatinine result needs to be interpreted alongside your muscle mass, hydration status, and diet. Creatinine is a muscle breakdown product, so people with high muscle mass naturally run higher levels. A large protein meal before the test raises it transiently. A single borderline reading is usually checked against your previous results and paired with a urine test rather than acted on in isolation.
Does Creatinine need to be measured fasting?
Not specifically, though a large meat meal shortly before the test can push creatinine slightly higher by adding dietary creatinine to the blood. Any fasting requirement on the request form usually comes from another test in the same panel rather than creatinine itself.
What does a creatinine of 1.5 mg/dL mean?
A creatinine of 1.5 mg/dL is above the normal range for both men (0.74–1.35 mg/dL) and women (0.59–1.04 mg/dL). It does not automatically indicate kidney disease: dehydration, a large protein meal, recent heavy exercise, or creatine supplements can all temporarily push the result above range. Repeating the test after adequate hydration and without those confounders is usually the first step. If it remains elevated, a doctor will calculate eGFR to assess kidney function. In UK units, 1.5 mg/dL is approximately 133 µmol/L.
Can drinking water lower creatinine?
Yes, if the elevated creatinine is caused by dehydration. Rehydration expands blood volume and reduces the concentration of waste products including creatinine, and a repeat test after adequate hydration will usually show a lower result. However, if the elevated creatinine is caused by kidney disease, high protein intake, or another structural cause, drinking more water will have little lasting effect on the result.
Can exercise raise my creatinine?
Yes — heavy exercise and creatine supplements raise it temporarily. For a true baseline, test on a rest day, well-hydrated, and mention any supplements to the lab.
My creatinine is normal but my eGFR is low — which one matters?
The eGFR matters more. In older or slight people, a 'normal' creatinine can mask reduced kidney function, which is exactly why eGFR is calculated. Discuss the pair with your doctor.
Will drinking more water lower my creatinine?
Dehydration raises creatinine, so arriving well-hydrated gives a truer reading — but water does not treat kidney disease. A persistently high value needs medical evaluation, not just fluids.
How often should creatinine be rechecked?
It depends on context: a one-off high value is usually repeated within days to weeks, while stable chronic kidney disease is monitored every few months. Your doctor sets the rhythm.
How much does the Creatinine test cost in India?
The Creatinine test typically costs ₹200–₹400 in India, though prices vary by city and lab. Choose a NABL-accredited lab where possible — and remember the reference range printed on your own report is the one that counts. Discuss the result with your doctor.

Pharmacist's practical notes

The medicine list matters enormously here: several common drugs — certain blood pressure medicines, some antibiotics, even common painkillers — raise creatinine or stress the kidneys. A new rise that coincides with a new prescription deserves a medication review before any kidney conclusion. Bring every medicine, including over-the-counter ones, to the discussion.

Dehydration is the great mimicker: a creatinine drawn during a stomach bug, heat exhaustion or poor fluid intake can look alarming and normalise with rehydration. If the draw happened on a rough day, say so — and recheck when well before worrying.

In India

Indian labs usually report creatinine in mg/dL. The test typically costs &rupee;200–&rupee;400, though prices vary by city and lab; eGFR is calculated from it at no extra charge.

Where possible, choose a NABL-accredited lab. Because muscle mass shifts the baseline, compare against your own previous values, not just the population range.

References

The clinical information on this page is drawn from peer-reviewed sources indexed by the US National Library of Medicine. Links go to the source so you can read it yourself.

  1. Renal Function Tests. In: StatPearls. Treasure Island (FL): StatPearls Publishing. NCBI Bookshelf NBK507821
  2. Creatinine Clearance. In: StatPearls. Treasure Island (FL): StatPearls Publishing. NCBI Bookshelf NBK544228
  3. Inker LA, Schmid CH, Tighiouart H, et al. Estimating glomerular filtration rate from serum creatinine and cystatin C. N Engl J Med. 2012;367(1):20–9. PMID 22762315 · doi:10.1056/NEJMoa1114248
  4. Rizk JG, Streja E, Wenziger C, et al. Serum creatinine-to-cystatin-C ratio as a potential muscle mass surrogate and racial differences in mortality. J Ren Nutr. 2022;33(1):69–77. PMID 34923112 · doi:10.1053/j.jrn.2021.11.005
  5. Kidney function tests. NHS. nhs.uk/conditions/kidney-function-tests/
Medical Disclaimer: This page is for general educational purposes only. It does not constitute medical advice. Always consult a qualified doctor before making any health decisions.
Written and medically reviewed by Suman Konda, Clinical Pharmacist · Sources linked to PubMed · Not medical advice: see our disclaimer