Frequency of red cell allo- and autoimmunization in patients with transfusion-dependent beta thalassemia and affecting factors

Abstract

In this study, we aimed to determine the frequency of red cell allo- and autoimmunization and analyze the factors responsible for the development of antibodies in patients with transfusion-dependent thalassemia. This crosssectional study was conducted on 139 patients with thalassemia major and intermedia who received leukodepleted RBC transfusions on a regular basis. Patients with a positive antibody screen were further tested for antibody identification by a gel method. Red cell alloantibodies were found in 9 (6.4%) patients, and autoantibodies were found in 17 (12.2%) patients. The most common alloantibodies detected were those against Rh and Kell antigen systems. The alloantibody development rate was higher in thalassemia intermedia patients, in Rh(-) patients, in patients with an initial transfusion age >2 years and in patients with a transfusion interval >3 weeks (p