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Test Code LAB4447 Cystatin C with Estimated GFR, Serum

Sunquest ordering code

CYSTAB

PERFORMING SITE

Pathology Laboratory; Des Moines, IA

SPECIMEN COLLECTION

Preferred Collection Container: 

SST (Serum Separator)
PST (Plasma Separator),

Also Acceptable Collection Container: 

Red (No Additive)
Green (Lithium Heparin)

Collection Information: Collect blood in a plasma or serum separator tube (green or red top also acceptable).

Capillary blood collections are unsuitable for use in this assay. Cystatin C concentrations were significantly lower in capillary samples compared to venous blood samples.

Transport Information: 0.5 mL of refrigerated serum in a transport tube.

CPT Codes

82610

Minimum Volume

0.2 mL of serum or plasma (approximately 0.5 mL of whole blood based upon normal patient hematocrit)

Specimen Stability

Stability Comments: 

1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.

Stability

Refrigerated Stability: 7 days

Frozen Stability: 6 months

Ambient Stability: 7 days

Reject Due To

Unacceptable Conditions: Capillary blood samples.

Method

Immunoturbidimetric

Notes

Performed: Daily

Analytical Time: Same day