Suspect<unk>  with patients who have more than one episode of Neisseria infection. Initial<unk>  tests often include C3 and C4, but not C5 through C9. Instead, the CH50 result may play a role in diagnosis: if the CH50 level is low but C3 and C4 are normal, then analysis of the individual<unk>  components may be warranted.
Terminal complement pathway deficiency
Complement 2 deficiency
Complement 3 deficiency
Complement deficiency
Acquired C1 esterase inhibitor deficiency
Leukocyte adhesion molecule deficiency
Neutrophil-specific granule deficiency
CD55 deficiency