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Cystatin C

Important Note

Centrifuge specimen to separate within 60 minutes of collection.

Additional Codes

LAB5168

Performing Laboratory

St Louis Children's Hospital Laboratory

Methodology

Particle Inhanced Immunoturbidimetric

Specimen Requirements

Specimen Type: Plasma
Container/Tube: Mint-green top (lithium heparin)
Specimen Volume: Full tube

Alternative Specimen Type: Serum

Alternative Container/Tube: Gold, Serum gel

Alternative Specimen Volume: Full tube

Day(s) Test Set Up

Test Availability:

Monday-Sunday

Cut-off time:

None; performed as received

Turnaround Time:

Same day; 2 hours from receipt in lab

Reference Values

<1 month:

1.00-3.00 mg/L

1-6 months:

1.00-2.00 mg/L

6 months-1 year:

0.70-1.50 mg/L

≥ 1 year:

0.60-1.20 mg/L

 

Interpretive data: Cystatin C concentrations vary widely in the first month of life, particularly in pre-term infants. Concentrations gradually diminish to adult levels by 1 year of life. Concentrations tend to rise with diminishing renal function in individuals greater than 60 years of age.

Specimen Stability Information

PROCESSED:

Ambient: 7 days

Refrigerated: 7 days

Frozen: 6 months

CPT Code

82610