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Test Code 1008
Cystatin C is a protein produced by all nucleated cells at a constant rate. It is the most reliable available serum marker of kidney function and is superior to creatinine in estimating glomerular filtration (eGFR) rate as it is much less affected by age, gender, muscle mass, and/or ethnic background.
1.0 mL serum (0.5 mL minimum) collected in serum separator tube (Tiger Top)
1.0 mL EDTA plasma (0.5 mL minimum) collected in plasma separator tube (Pearl Top)
Refrigerated (ship on frozen cold packs)
Refrigerated: 3 days
- Normal: ≤1.20 mg/L
- High: >1.20 mg/L
Cystatin C used to calculate estimating glomerular filtration rate (eGFR).
- Refer to Estimated Glomerular Filtration Rate (eGFR)/Cystatin C for treatment considerations.