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A GFR marker independent of muscle mass — useful when creatinine misleads (extremes of body composition, cirrhosis).
Cystatin C is produced by all nucleated cells and filtered freely — its serum level estimates GFR without muscle-mass bias. Cystatin-based eGFR helps confirm CKD when creatinine is ambiguous, in sarcopenia, amputees, and liver disease. The Cystatin C eGFR calculator applies the formulas.
The most measured kidney blood test — a muscle-waste product filtered by the glomeruli, interpreted with eGFR.
A calculated value estimating the rate at which kidneys filter blood, used to diagnose and stage chronic kidney disease.
The volume of plasma filtered by the glomeruli per minute — the best overall measure of kidney function.
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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.