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The most measured kidney blood test — a muscle-waste product filtered by the glomeruli, interpreted with eGFR.
Serum creatinine is convenient but imperfect: it lags true GFR changes, varies with muscle mass, age, sex, and diet, and rises only after significant function loss. It anchors eGFR equations (CKD-EPI) and trend monitoring. Stable trends matter more than single values.
A waste product of muscle metabolism filtered by the kidneys; serum creatinine levels are used to estimate GFR and monitor kidney function over time.
A calculated value estimating the rate at which kidneys filter blood, used to diagnose and stage chronic kidney disease.
A GFR marker independent of muscle mass — useful when creatinine misleads (extremes of body composition, cirrhosis).
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This content is a general reference, not medical advice, a diagnosis, or a treatment plan. Do not change your diet, fluids, medicines, or dialysis plan without your nephrologist or renal dietitian. Individual recommendations depend on your labs, medications, conditions, and care plan.