Figure 4From: Emerging concepts in the diagnosis and treatment of patients with undifferentiated angioedema Diagnostic considerations in patients who present with nonallergic angioedema. ACE, angiotensin-converting enzyme; NSAIDs, nonsteroidal anti-inflammatory drugs; C1-INH, C1 esterase inhibitor; HAE, hereditary angioedema; WNL, within normal limits. Modified from [8]; with permission. [PERMISSION PENDING].Back to article page