CH50 BLOOD (C50)
: > 160 CH50 units
: Red top (clot activator with gel) or red top (no gel)
: Draw 2 bullets
: 5 mL
: 1 mL whole blood
: Must be refrigerated, spun and frozen within 6 hours.
Reasons for Rejection
: Drawn in any anticoagulant
: Up to 7 days
: If patient is on heparin, individual complement components should be ordered, as heparin is anti-Complementary, and CH50 result may not be accurate.
: Send to lab immediately. Both time and temperature affect complement levels. Specimen must not contain anticoagulant.
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