Test guide
Creatinine Test
This test measures creatinine levels in a sample of your blood and/or urine (pee). Creatinine is a normal waste product in your body. It's made when you use your muscles and some of the muscle tissue breaks down.
What it is for
A creatinine test is used to help: Creatinine testing alone isn't the best way to check how well your kidneys are working. That's because people make different amounts creatinine depending on how much muscle they have, the foods they eat, their age, and how active they are. So, the results from creatinine testing are often used in calculations or compared with other substances to help get more information: Source: MedlinePlus, National Library of Medicine. Medical test information is public domain. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Limitations
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
Also known as
- blood creatinine, serum creatinine, urine creatinine, kidney function, renal function
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