Complement Diagnostics: Concepts, Indications, and Practical Guidelines

Table 1

Complement function of the CP and AP, plasma concentrations of C3, C4, factor B, and C3d,g, and the C3d,g*1000/C3 ratio in one patient with SLE and one patient with a C2 deficiency.

	CP (%)	AP (%)	C3 (g/L)	C4 (g/L)	Factor B; (g/L)	C3d,g; (mg/L)	C3d,g*1000/C3
SLE	15	45	0.53	0.07	0.18	7.0	13.2
C2 def	5	97	0.80	0.14	0.30	3.5	4.4
Reference interval	80–120	50–150	0.67–1.29	0.13–0.32	0.16–0.44	<5.3	<5.3