ARUP's Laboratory Test Directory
| 0050198: Complement Activity Enzyme Immunoassay, Total |
| Test Mnemonic: CH50 | |
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Methodology: Enzyme-Linked Immunosorbent Assay
Performed: Mon-Fri Reported: 1-4 days |
| Specimen Required: | |
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Collect: One 7 mL plain red. Allow to clot for one hour at room temperature.
Transport: 1 mL serum, frozen. (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube. Pediatric Collection/Transport: 0.15 mL serum, frozen. Remarks: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered. Allow specimen to clot for one hour at room temperature. Separate serum from cells ASAP and freeze. Plasma is not recommended. Do not use separator tubes or gels. Unacceptable Conditions: Specimens left to clot at 2-8°C. Specimens exposed to repeated freeze/thaw cycles. Separator tubes. Nonfrozen specimens. Stability: After separation from cells: Ambient: 2 hours; Refrigerated: Unacceptable; Frozen: 2 weeks |
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| Reference Interval: |
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Low: 59 CAE Units or less Normal: 60-144 CAE Units High: 145 CAE Units or greater |
| CPT Code(s): | |
| 86162 |