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Kidney & liver
Cystatin C
Clinical biomarkerRenal functionBloodmg/L
A filtration marker used to estimate kidney function.
What it measures
Circulating cystatin C cleared largely by glomerular filtration.
Why it matters
Can complement creatinine-based eGFR and improve kidney-function assessment in selected settings.
How to interpret it
Use validated eGFR equations and clinical context.
Important limitations
Can be influenced by factors beyond filtration; it is not an aging-specific biomarker.
Evidence status
Clinical biomarker
Established renal biomarker; useful as part of health-risk assessment.
Research & guidance
Original papers, validation studies, reviews and clinical guidance connected to this measurement.
For education and evidence exploration, not diagnosis or individualized medical advice.