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13529 Pathology

An 18-year-old woman comes to the emergency room with recurrent facial edema, especially around her lips. She also has recurrent bouts of intense abdominal pain and cramps, sometimes associated with vomiting. Laboratory examination reveals decreased C4, while levels of C3, decay-accelerating factor, and IgE are within normal limits. A deficiency of which of the following substances is most likely to be associated with these findings?

AC1 esterase inhibitor
BComplement components C3 and C5
CDecay-accelerating factor
DNone of the above
Pathology
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