ARUP's Laboratory Test Directory

Complement Activity Enzyme Immunoassay, Total : 0050198

Mnemonic: CH50

Methodology: Semi-Quantitative Enzyme-Linked Immunosorbent Assay
Performed: Mon-Fri
Reported: 1-2 days
Specimen Required: Collect: Plain red.

Specimen Preparation: Allow specimen to clot for one hour at room temperature. Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.3 mL)

Storage/Transport Temperature: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Unacceptable Conditions: Separator tubes. Specimens left to clot at 2-8°C. Specimens exposed to repeated freeze/thaw cycles. Non-frozen specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 2 hours; Refrigerated: Unacceptable; Frozen: 2 weeks
Reference Interval:
Effective May 16, 2011

60-144 CAE Units
CPT Code(s): 86162
Cross References: CH100 (Complement Activity Enzyme Immunoassay, Total), CH50 (Complement Activity Enzyme Immunoassay, Total), Classic Complement Pathway Assessment-CH100 (Complement Activity Enzyme Immunoassay, Total), Complement CH100, Total (Complement Activity Enzyme Immunoassay, Total), Total Complement CH100 (Complement Activity Enzyme Immunoassay, Total), Total Complement CH50 (Complement Activity Enzyme Immunoassay, Total)