Abstract
A 33-year-old man was referred to our institution with a 5-year history of abdominal pain and diarrhea and recent weight loss. There was no history of recurrent sinopulmonary infection. A maternal history of celiac disease was reported Laboratory test results were normal except for a deficiency of serum immunoglobulin (Ig) A (<0.36 g/L; normal range, 0.7-4.0 g/L). Levels of both total serum IgG (7.9 g/L; normal range, 7.0-16.0 g/L) and IgG 1-4 subclasses (5.9 g/L, 2.2 g/L, 0.5 g/L, and 0.2 g/L, respectively) were within normal ranges.
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