Specimen Requirements


Cystatin C with eGFR

Specimen Requirement

Overnight fasting is preferred.

Collect SST/1.0 mL serum, after 30 minutes of clotting, promptly centrifuge and send.


Particle Enhanced Turbidimetric Immunoassay (PETIA)


Room temp: 26 days, Refrigerated: 26 days, Frozen: 10 Years

Reference Range

By Report*


2-4 days, Set up Monday, Wednesday and Friday

Clinical Use

Since it is formed at a constant rate and freely filtered by the healthy kidney, cystatin C is a good marker of renal function. Serum concentrations of cystatin C are almost totally dependent on glomerular filtration rate (GFR). A reduction in GFR causes a rise in the concentration of cystatin C.

Can be used as a confirmatory test for the diagnosis of chronic kidney disease (CKD) in patients with a decreased GFR as estimated from creatinine.

Test Code