A waste product cleared by the kidneys — primary marker of kidney function.
What is it
Creatinine is produced from muscle metabolism and cleared by the kidneys. Blood levels reflect the balance of muscle production and kidney clearance.
Why it's measured
Creatinine has been the foundational marker of kidney function in clinical practice and research for decades.
Reference range
Standard laboratory reference
Men: 0.7 – 1.3 / Women: 0.6 – 1.1 mg/dL
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Has been associated with reduced kidney function in research literature.
Lower
Often reflects low muscle mass.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Part of standard metabolic panels and routine physicals.
Related markers
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.