Normal Creatinine Levels by Age and Sex
Why creatinine reference ranges vary with age, sex and muscle mass.
Last updated: 2026-09-24
Creatinine depends on muscle mass, so the normal range varies. Adult values are roughly 0.6–1.2 mg/dL, with men typically a little higher than women.
Why it varies
More muscle means more creatinine. Older adults with less muscle may have lower values that still reflect reduced function — which is why eGFR is more reliable.
Frequently asked questions
Is a creatinine of 1.4 normal?
It is above the typical range for many adults, but muscle mass and age matter. Confirm with eGFR and clinical review.