Figure 5From: Emerging concepts in the diagnosis and treatment of patients with undifferentiated angioedema International consensus algorithm for the diagnosis of hereditary angioedema. ACE, angiotensin-converting enzyme; C4, complement factor 4; C1-INH, C1 esterase inhibitor; HAE, hereditary angioedema. Modified from [24]; with permission. [PERMISSION PENDING].Back to article page