Cys-C
Up to 7 days
Turbidimetry (directly traceable to ERM-DA471/IFCC, the international standard reference material)
This test is reported with a calculated eGFR (estimated glomerular filtration rate). If a result is required with a shorter turnaround time (TAT), use the in-house Cystatin C order (Test code 18150) and use the validated online calculator to calculate the eGFR:
https://www.kidney.org/professionals/gfr_calculator
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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.
Serum or Plasma
1 mL
Serum Separator Tube (SST; Gold Top) Lithium-heparin Plasma (Green Top)
Overnight fasting is preferred.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Refrigerated | 7 days |
| Frozen | 6 months |