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Test Code FCQBA C1Q Binding Assay

Reporting Name

C1Q Binding Assay

Performing Laboratory

ARUP Laboratories

Specimen Type


Specimen Required

Draw blood in a plain, red-top tube(s). (Serum gel tube is acceptable.) Separate from cells within 2 hours of collection. Send 1 mL of serum frozen in a plastic vial.

Specimen Minimum Volume

0.3 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen 14 days

Reference Values

C1Q Binding Assay            0.0 - 3.9 ugE/mL


Less than 4 ugE/mL is considered negative for circulating complement binding immune complexes.


Circulating immune complexes may be found without any evident pathology and positive results do not necessarily implicate the immune complex in a disease process.


Day(s) and Time(s) Performed

Monday and Thursday

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FCQBA C1Q Binding Assay 27831-7


Result ID Test Result Name Result LOINC Value
Z2636 C1Q Binding Assay 27831-7

Method Name

Semi-Quantitative Enzyme-Linked Immunosorbent Assay (ELISA)