Creatinine
Quick answer
What is Creatinine?
Creatinine reflects kidney filtration capacity (via eGFR, calculated from creatinine, age, and sex). Affected by muscle mass — heavily-muscled men run higher creatinine without kidney disease.
- Units:
- µmol/L
- Reference range:
- 60-110 µmol/L (men)
- Sample:
- Venous blood (serum)
- Category
- Kidney
- Units
- µmol/L
- Reference range
- 60-110 µmol/L (men)
What does a high Creatinine result mean?
Reduced kidney function, dehydration, high muscle mass, certain medications. Persistent elevation with reduced eGFR warrants investigation.
What does a low Creatinine result mean?
Low muscle mass, severe malnutrition.
Why does Creatinine matter?
Kidney function silently declines. Annual creatinine + eGFR catches it before it's a problem.
References
- [1]KDIGO Clinical Practice Guideline for the Evaluation of CKDPubMed / Kidney Int
- [2]Clinical Methods: The History, Physical, and Laboratory ExaminationsNCBI Bookshelf
Want Creatinine interpreted in the context of your full panel? Every FORM bloodwork tier covers it, with an MD walking you through the result.
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