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C4d Fragment, EIA (4943X)
Test Code4943N
CPT Codes
83520
Preferred Specimen
1 mL plasma collected in an EDTA (lavender-top) tube
Minimum Volume
0.2 mL
Instructions
Do not thaw
Transport Temperature
Frozen
Specimen Stability
Room temperature: Unacceptable
Refrigerated: 4 hours
Frozen: 14 days
Refrigerated: 4 hours
Frozen: 14 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
SST tubes are not acceptable • Gel barrier interferes with assay methodology • Hemolysis
Methodology
Enzyme Immunoassay (EIA)
FDA Status
This test was performed using a kit that has not been cleared or approved by the FDA. The analytical performance characteristics of this test have been determined by Quest Diagnostics. This test should not be used for diagnosis without confirmation by other medically established means.
Setup Schedule
Night Sets up 1 day a week.
Clinical Significance
Clinical use is to exclude known rheumatoid arthritis, systemic lupus erythematosus, and chronic uticaria with hypocomplementemia. C4d is a stable activation product of C4 cleavage, and is useful to determine classical pathway complement activation.
