Acute hemolytic reaction due to A-B mismatched transfusion in a cat with transient AB blood type

Journal of Veterinary Emergency and Critical Care
Amie KoenigU Giger

Abstract

To document a case of transient AB blood type indicated by immunochromatography in a type B cat following administration of an incompatible type A transfusion. A 7-month-old neutered male domestic longhair cat was evaluted for anemia, pigmenturia, and intravascular hemolysis 1 day after receiving a feline whole blood transfusion. Neither blood donor nor patient had been blood-typed or crossmatched. The cat presented in shock with a severe non-regenerative anemia, hyperlactatemia, hyperbilirubinemia, hemoglobinemia, hemoglobinuria, and a positive saline slide agglutination test. Immunochromatographic blood typing tests initially indicated the cat had type AB blood, but crossmatch tests with blood from type A and type B donors suggested that the cat was type B. The cat was transfused with type B packed red blood cells without apparent complications and clinically improved. The cat's blood type reverted to type B once all the previously transfused type A cells were cleared from circulation. Furthermore, the original donor was subsequently identified as a Siamese cat and confirmed to have type A blood. While the cause of the original anemia remained unknown, the cat completely recovered and regained a normal hematocrit. This is the...Continue Reading

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