Can HAE be Identified and Diagnosed Earlier if a Complement 4 Level is Done on All Patients Presenting with Acute Angioedema

Allergy fellows went to four local emergency rooms and talked to the ER staff and residents within the medicine and pediatric department at Tulane University and Ochsner Clinic Foundation to screen all patients that have a history or present with recurrent angioedema without urticaria. 15 patients were identified in a 2-month time period and followed up in Allergy Clinic for further evaluation.