Cystatin C
Test ID:
702899
CPT code:
82610
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.
Specimen Type:
Serum or plasma
Requested Volume:
1 mL
Minimum Volume:
0.5 mL
Container Type:
Red-top tube, gel-barrier tube, or green-top (heparin) tube
Patient Preparation:
Overnight fasting is preferred.
Collection:
Separate serum or plasma from red blood cells.
Storage Instructions:
Room temperature
Stability Requirements:
Temperature |
Period |
---|---|
Room temperature |
14 days |
Refrigerated |
14 days |
Frozen |
14 days |
Freeze/thaw cycles |
Stable x3 |
Rejection Criteria
Specimen other than serum or heparinized plasma; gross lipemia that cannot be cleared by ultracentrifugation
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