CYSTATIN C, SERUM

Test Documentation
Specimen Required
Draw blood in a SST. Allow specimen to clot at room temperature, centrifuge and separate serum from cells within 2 hours. Send 1.0 mL serum (0.4 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Plasma: Sodium or lithium heparin
Serum: Red-top

Rejection Criteria
Grossly hemolyzed specimens

Methodology
Quantitative Nephelometry

Stability
Room Temperature: Unacceptable; Refrigerated: 7 days; Frozen: 2 months

Reference Range
0-3 months:   0.8-2.3 mg/L  
4-11 months:   0.7-1.5 mg/L  
1-3 years:   0.5-1.3 mg/L  
4-8 years:   0.5-1.3 mg/L  
9-17 years:   0.5-1.3 mg/L  
18 years and older:   0.5-1.0 mg/L  

Performed
Sunday-Friday

Turnaround Time3 days
Test CodeCYSTC
CPT-4 Code (s)
82610
LOINC Codes
33863-2

Warde
Medical
Laboratory