Table 1 Complement testing
Protein and technique | Result | Normal range |
|---|---|---|
CH50 (hemolytic assay) | 136% | 70–130 |
C3 antigen (nephelometry) | 1430 mg/L | 660–1250 |
C4 antigen (nephelometry) | 283 mg/L | 93–380 |
Factor B antigen (nephelometry) | 195 mg/L | 90–320 |
Factor H antigen (ELISA) | 149% | 65–140 |
Anti-factor H antibodies (isotype IgG) (ELISA) | negative | |
Factor I antigen (ELISA) | 137% | 70–130 |
Membrane expression of CD46 (MCP) at the surface of granulocytes CD33+ (Beckman Coulter cytometer, type Navios) | 18.8 | 13.0–19.0 |