Creatinine and eGFR — Kidney Function — 60-Second Protocol
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lab guide · 2026-09-10
If you lift, your creatinine can read high without your kidneys being in any trouble.
Serum creatinine and the calculated eGFR estimate the kidney filtration rate. Creatinine levels vary with body size and muscle mass, so read the result in that context.
The protocol
| Units | Creatinine mg/dL; eGFR mL/min/1.73m² |
| Standard range | Creatinine 0.7–1.3 mg/dL (men), 0.5–0.95 mg/dL (women); an eGFR of 60 or more is in the normal range (ranges vary by lab) |
| eGFR 90–120 | normal kidney function (NIDDK) |
| eGFR 60–89 | mild decrease in function (NIDDK) — ask your clinician whether to recheck and add a urine ACR |
| eGFR 15–59 | moderate to severe decrease in function (NIDDK) — see a clinician |
| eGFR <15 | kidney failure (NIDDK) — needs prompt clinician care |
| Testing | ask whether a urine albumin-to-creatinine ratio (UACR) should be added — eGFR and urine albumin are the two key markers for kidney disease |
| Medication | regular use of NSAIDs such as ibuprofen and naproxen can damage the kidneys — ask your pharmacist or clinician whether the medicines you take are safe for you |
Full transcript
If you lift, your creatinine can read high without your kidneys being in any trouble. Serum creatinine and the calculated eGFR estimate filtration rate, and heavily muscled adults run higher creatinine — read it with body composition in mind. eGFR above ninety is normal. Sixty to eighty-nine is mildly reduced: recheck and pair it with a urine albumin-to-creatinine ratio. Thirty to fifty-nine is moderate and goes to a clinician; below thirty is an urgent referral. Two litres of water a day, moderate protein, low salt, and review any regular painkillers with a clinician. agegen.ai. Generate your prime age! ~~ Mr. Age
Sources
- https://medlineplus.gov/lab-tests/creatinine-test/
- https://medlineplus.gov/ency/article/003475.htm
- https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/tests-diagnosis
- https://www.niddk.nih.gov/health-information/professionals/advanced-search/explain-kidney-test-results
- https://www.niddk.nih.gov/health-information/kidney-disease/keeping-kidneys-safe
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