Common Variable Immunodeficiency (CVID) is a rare primary immunodeficiency disease with heterogeneous clinical and immunological features. In all patients levels of serum immunoglobulins are absent or reduced, We presented the main clinical and immunological problems of 34 CVID patients who were followed in S.B. Ankara Dıskapı Children's Hospital, Pediatric Immunology Division, between the years of 2000-2007. Nine patients had agammaglobulinemia while 25 patients had hypogammaglobulinemia. Chronic respiratory infection (bronchiectasis) was present in 12 (35 %), chronic diarrhea with malabsorbtion in 10 (29 %), various autoimmune diseases in 8 (23 %) and lymphoid malignancies in 3 (9 %) patients in our series. Data received from this study showed that bronchiectasis was more prevalent in agammaglobulinemic patients while autoimmunities were more frequently developed in hypogammaglobulinemic patients. It was also seen that the clinical and laboratory features of CVID patients whose parents are consanguineous were more severe than sporadic cases

Keywords: Common Variable Immunodeficiency, bronchiectasis, agammaglobulinemia, hypogammaglobulinemia