Biomarker education
Creatinine
Also called: Serum creatinine
Creatinine is a waste product measured in blood and often used when assessing kidney-related lab context.
General biomarker education — not personalized medical advice. Learn more
What it generally measures
Muscles produce creatinine as part of normal metabolism. Kidneys help clear it; labs report the concentration in serum or plasma.
Common units on reports: mg/dL
Why people track it over time
Creatinine is frequently reviewed with eGFR over time. Changes can have many explanations — only a clinician can interpret them for you.
Changes over time do not by themselves establish a diagnosis. Learn more
Questions you might ask a healthcare professional
- Ask how this creatinine compares with your prior values and with eGFR on the same report.
- Mention medications or hydration context your clinician has said may matter.
- Ask whether the lab’s reference range and method match prior reports.
Related markers
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