Test ID: C4
CPT code: 86160
LOINC: 4498-2
Specimen Type: SERUM
Frequency: Setup: Mon-Fri; analytic time 3 days
Instructions: 0.5 mL serum from SST tube. Centrifuge as soon as clotted.
Text: Investigating an undetectable total complement level; confirming
hereditary angiodema; assessing disease activity in SLE, proliferative
glomerulonephritis, rheumatoid arthritis, and autoimmune hemolytic
anemia.
Methodology: Nephelometry