Test Name
COMPLEMENT C4
Aliases
COMPLEMENT COMPONENT 4
Abbreviations
C4
Test Classification
INDIVIDUAL
Department
SPECIAL CHEMISTRY
Sub Department
-
TAT Category
BUSINESS (WORKING) TIME
Estimated TAT
96
TAT Units
HOURS
Test Requirements
10-12 hr fasting preferred. Serum in plain tube (red top) or SST tube (yellow top) or in a separation vial. Centrifuge tubes within 1 hour. Separate centrifuged serum in plain tubes within 1 hour. TEMPERATURE SENSITIVE ANALYTE. Frozen (preferred) . Refrigerated acceptable. Ambient (room) temperature not acceptable.
Clinical Utility
Suspected complement consumption (e.g. in SLE, cryoglobulinemia). Monitoring disease activity, glomerulonephritis in SLE. Evaluation of recurrent unexplained bacterial infections, atypical hemolytic uremic syndrome or hereditary angioedema.
Last Review
26th Feb 2026