The authors regret the following error. In the article “Alloimmunization screening after transfusion of red blood cells in a prospective study” [Rev Bras Hematol Hemoter. 2012;34(3): 206–11], in the Introduction section, where it reads:

“Additionally, RBC alloimmunization investigations are often preformed only after transfusion events and many alloantibodies may not be detected as no further transfusions are required or because the titer of antibodies decreases over time and reaches a non-detectable level prior to testing.”

It should read:

“Additionally, RBC alloimmunization investigations are often performed only before transfusion events and many alloantibodies may not be detected as no further transfusions are required or because the titer of antibodies decreases over time and reaches a non-detectable level prior to testing.”