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Vanderbilt Pathology Laboratory Services

Test Directory



CH50 BLOOD (CH50)

Department: Immunology
Test Synonym(s): C50
CPT Codes: 86162
Reference Range: > 160 CH50 units
Tube Type: Red top (clot activator with gel) or red top (no gel)
Specimen: Blood
Alternate Specimen: None
Pediatric Requirements: Draw 2 bullets
Volume: 5 mL
Minimum Volume: 1 mL whole blood
Temperature: Must be refrigerated, spun and frozen within 6 hours.
Reasons for Rejection: Drawn in any anticoagulant
Days Performed: Tuesday
Times Performed: Afternoon
TAT: Up to 7 days
Significance: If patient is on heparin, individual complement components should be ordered, as heparin is anti-Complementary, and CH50 result may not be accurate.
Special Instructions: Send to lab immediately. Both time and temperature affect complement levels. Specimen must not contain anticoagulant.

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