A cold scare: Formation of cold reactive anti-A1 coinciding with gross hemolysis

Practical Laboratory Medicine
Jeffrey Petersen, Darshana Jhala

Abstract

Anti-A1 antibodies can be found as a usually clinically insignificant naturally occurring cold IgM antibody in A-subgroup patients. It is known from multiple prior case reports that warm-reactive anti-A1 that reacts at 37 °C can be clinically significant, and it has been previously reported that it could form after alloimmunization with donor A1 red blood cell (RBC) transfusion. In addition, the development of anti-A1, often as an autoantibody, have been described in the setting of various malignancies, perhaps due to expressed subtle alterations of the ABO antigens provoking an immune response. Here, we report a rare case of a cold-reactive anti-A1 alloantibody (after multiple transfusions with group A1 RBC units) in a 76 year old male patient (A2) with history of myelodysplastic syndrome and metastatic carcinoma who presented with hemolytic anemia and dark urine. The patient had previously typed as blood type A without reverse typing reaction for anti-A1; as a result, the patient had been transfused with group A1 RBCs. Four days prior to discovery of the ABO discrepancy, the patient had a febrile transfusion reaction associated with his A1 RBC transfusion. On admission, his immunohematology workup demonstrated an alloantibody...Continue Reading

Methods Mentioned

BETA
biopsy

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