A 65-year-old female has a history of frequent UTIs for the last year. Serum immunoglobulins showed low levels of IgG 515 mg/dL (reference range 700 to 1600), IgM 30 (reference range 40 to 230), IgA 50 (reference range 70 to 400).
What is the reason for the low levels of immunoglobulins?















