A 21-year-old woman has a history since childhood of recurrent episodes of swelling of the submucosal and subcutaneous tissue of the gastrointestinal and respiratory tracts. Her C1 inhibitor level is less than 5% of the reference value. These findings support a diagnosis of:
DiGeorge syndrome Hereditary angioedema Nutritional based immune deficiency Paroxysmal nocturnal hemoglobinuria