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Test Code LAB5168 CYSTATIN C

Performing Laboratory

St. Louis Children's Hospital

Methodology

Particle Inhanced Immunoturbidimetric

Specimen Requirements

Specimen Type:

 Blood

Container/Tube

 

Preferred:

Mint green-top (lithium heparin) Vacutainer®

 

Acceptable:

green SAMPLETTE™/MICROTAINER®, plain red-top vacutainer ®, or Gold/Red SST gel vacutainer®

 

Collection Volume:

2.0 mL (minimum 0.6 mL)

 

Patient Preparation:

None

 

Sample Rejection

Mislabeled or unlabeled specimens.

 

Special Instructions:

Send to lab promptly.

Reference Values

Reference Range:

<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.

Critical Values:

None established

Limitations:

NA

Test Classification:

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions

CPT Coding

82610

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

Lab Testing Section:

Chemistry

Specimen Transport Temperature

Lab Processing instructions:

Centrifuge specimen to separate within 60 minutes of collection. If specimen is collected in microtainer or plain, red-top tube aliquot sample into a conical tube for testing (labeling aliquot with specimen type).

 

Processed Volume:

minimum 0.3 mL plasma/serum

 

Analyte Stability:

PROCESSED:

Ambient: 7 days

Refrigerated: 7 days

Frozen: 6 months