From: Case report presenting the diagnostic challenges in a patient with recurrent acquired angioedema, antiphospholipid antibodies and undetectable C2 levels
Antibodies
Result
Reference range
C1Q autoantibody
3
[< 4.2]% of STD
C1 EST IHN—autoantibody free IgG
25.4
[0.89–39.1]% of STD
C1 EST IHN—autoantibody bound IgG
[0.3–46.3]% of STD