ARUP's Laboratory Test Directory

C1q Binding Assay : 0050301

Mnemonic: C1Q

Methodology: Semi-Quantitative Enzyme-Linked Immunosorbent Assay
Performed: Mon, Thu
Reported: 1-8 days
Specimen Required: Collect: Plain red.

Specimen Preparation: Let stand on clot for two hours. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.3 mL) If ordered in conjunction with a Raji Cell Assay, transfer two 1 mL aliquots of serum to individual ARUP Standard Transport Tubes.

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

Unacceptable Conditions: Non-frozen specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 2 hours; Refrigerated: Unacceptable; Frozen: 2 weeks (avoid repeated freeze/thaw cycles)
Reference Interval:
Less than 4 µgE/mL is considered negative for circulating complement binding immune complexes.
Interpretive Data: Circulating immune complexes may be found without any evident pathology and positive results do not necessarily implicate the immune complex in a disease process.
CPT Code(s): 86332
Cross References: Circulating Immune Complex Detection (C1Q Binding Assay), Immune Complex Assay (C1Q Binding Assay)