Article · 4 min read
Normal Creatinine Levels by Age and Sex
Why creatinine "normal" ranges vary with age, sex and muscle mass.
Creatinine depends on muscle mass, so "normal" 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 levels that still reflect reduced function — which is why eGFR is more reliable.
When to act
A single mildly high value is not a diagnosis. Trends over time, plus urine protein and eGFR, tell the real story.
Frequently Asked Questions
Is creatinine 1.4 normal?
It is above the typical range for many adults, but muscle mass and age matter. Confirm with eGFR and a doctor's review.
Sources
Related articles
This page is for general education only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified doctor about your specific condition.