Cystatin C (without eGFR)

Cys-C

Up to 24 hours

Turbidimetry (directly traceable to ERM-DA471/IFCC, the international standard reference material)

Note that this test is not reported with a calculated eGFR (estimated glomerular filtration rate). If an eGFR is required, use the validated online calculator:
https://www.kidney.org/professionals/gfr_calculator

Accredited NRL Laboratory

Daily

Cystatin C is a reliable biomarker of glomerular filtration rate (GFR) used to assess kidney function. Because it is produced steadily by all nucleated cells, its levels are independent of muscle mass, diet, or age, making it an excellent alternative or complement to creatinine.

Note: an eGFR is NOT reported with this order.

Serum or Plasma

0.5 mL

Serum Separator Tube (SST; Gold Top) Lithium-heparin Plasma (Green Top)

No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.

This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.