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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