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Diagnosis Table 1. Complement Levels in the Diagnosis of HAE C1INH Level C1INH Function C4 Level C3 Level C1q Level Type I HAE Low Low Low NL NL Type II HAE NL Low Low NL NL HAE with normal C1INH NL NL NL NL NL Acquired C1INH Deficiency Low Low Low NL-Low Low ACE-I NL NL NL NL NL Idiopathic Angioedema NL NL NL NL NL ACE-I, angiotensin converting enzyme inhibitor; HAE, hereditary angioedema; INH, inhibitor; NL, normal