Reference ranges
Creatinine reference range
Reference ranges describe the interval a laboratory prints next to your result. They are not a diagnosis of what is “normal” for you personally — your clinician interprets results in context.
General biomarker education — not personalized medical advice. Learn more
What Creatinine measures
Muscles produce creatinine as part of normal metabolism. Kidneys help clear it; labs report the concentration in serum or plasma.
Why ranges differ
Laboratories set their own reference intervals using their methods, equipment, and population data. That is why the range on your Quest report may differ from a LabCorp report — always use the interval printed on your source document.
Common units
Creatinine is often reported in mg/dL. Confirm units on your original report before comparing values across time.