Biomarker mg/dl (µmol/l)
Creatinine
Muscle metabolism byproduct used as a kidney function marker
Also known as
serum creatinine creatinin
Definition
Creatinine is a breakdown product of creatine phosphate metabolism and is excreted exclusively by the kidneys. It is the most common serum marker for estimating kidney function, though results are influenced by muscle mass and hydration status. The eGFR is preferred for more precise assessment; creatinine may be temporarily elevated with creatine supplementation.
| Parameter | Value |
|---|---|
| Unit | mg/dl (µmol/l) |
| Reference Range | Women: 0.50–0.90 mg/dl | Men: 0.70–1.20 mg/dl |
| Optimal Range (lab2go) | Women: 0.6–0.9 mg/dl | Men: 0.8–1.1 mg/dl |
Last Reviewed: 17 April 2026 · maritta