Table 2.

Laboratory workup of TMA etiology

Variables	Result	Reference range
C3 (g/L)	0.83	0.70–1.40
C4 (g/L)	0.11	0.10–0.40
CH50(U/mL)	30.3	23.0–46.0
ADAMTS13 activity–before plasma exchange (%)	46	70–120
ADAMTS13 activity–after plasma exchange (%)	86	70–120
ADAMTS13 inhibitor (BU)	0	0–0.6
Complement factor H antibody	Negative	Negative
Complement factor H (ug/ml)	517.4	247.0–1010.8

CH50 50% hemolytic unit of complement, ADAMTS13 Plasma A disintegrin-like and metalloprotease with thrombospondin type 1 motifs 13