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Cerner Order Name Comp C4 Complement C4

Performing Laboratory

St. Louis Children's Hospital

Lab Dept

Core Lab Chemistry

Specimen Requirements

Specimen Type: Blood

Container/Tube  
Preferred: Light green-top (lithium heparin) Vacutainer
Acceptable: green SAMPLETTE/MICROTAINER, plain red-top vacutainer, or Gold/Red SST gel vacutainer.
Collection Volume: 1.0 mL (minimum 0.6 mL)

Patient Preparation: None
Sample Rejection: Mislabeled or unlabeled specimens.
Special Instructions: Send to lab promptly.

Logistics

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

Interpretive

Reference Range:

<1 Years: 5.0-30.0 mg/dL
≥ 1 Years: 10.0-40.0 mg/dL

Critical Values: No critical value established
Limitations: In very rare cases gammopathy, in particular type IgM (Waldenstrom's macroglobulinemia), may cause unreliable result.
Methodology: Immunoturbidimetric Assay

Additional Information

For SLCH Laboratory use only

Lab Processing instructions: Centrifuge specimen to separate. 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:

Ambient - unprocessed: 8 hours

PROCESSED:

Ambient: 2 days

Refrigerated: 2 days

Frozen: NA
Notes: Will also accept EDTA plasma

General Information

EPIC order name: Complement C4 (EPIC Test # LAB5780)
Cerner order name: Comp C4
CPT Codes: 86160
LOINC Value: 4498.2
Synonyms: Fourth Component of Complement

Last Reviewed

November 2024