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Test ID FCQBA C1Q Binding Assay

Method Name

Semi-Quantitative Enzyme-Linked Immunosorbent Assay (ELISA)

Reporting Name

C1Q Binding Assay

Specimen Type


Specimen Required

Draw blood in a plain, red-top tube(s). (Serum gel tube is acceptable.) Separate from cells and freeze immediately. 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 ug Eq/mL


Less than or equal to 3.9 ug Eq/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

Performing Laboratory

ARUP Laboratories

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