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Fy3 is a high-prevalence red blood cell antigen of the Duffy (Fy) blood group system. Anti-Fy3 antibodies are rare and solely arise in individuals with a Duffy null phenotype (Fy(a-b-)), which is a phenotype that mainly occurs in people of African descent. Clinically, anti-Fy3 antibodies can cause both acute and delayed hemolytic transfusion reactions in adults as well as hemolytic disease in fetuses and newborns.

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Measurement of macrophage marker in hyperhaemolytic transfusion reaction: a case report.

Transfus Med

April 2012

Department of Red Cell Immunology (RCI), NHS-Blood and Transplant, Tooting Centre, London, UK.

Background: Hyperhaemolytic transfusion reaction (HHTR) has been well described in patients with sickle cell disease (SCD). It is characterised by a decrease in haemoglobin concentration to levels below those before transfusion and a fall in the absolute reticulocyte count. As red blood cells (RBC) alloantibodies are typically not detected in post-transfusion samples in acute forms of HHTR, we have previously proposed that both the transfused and autologous RBCs cells (HbSS/reticulocytes) are destroyed by activated macrophages.

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Hyperhemolytic transfusion reaction attributable to anti-Fy3 in a patient with sickle cell disease.

Immunohematology

November 2009

Department of Pathology and Laboratory Medicine, University of Texas Health Science Center, Houston, TX 77030, USA.

A case of hyperhemolytic transfusion reaction attributable to anti-Fy3 in a 30-year-oldAfricanAmerican woman with a history of sickle cell disease is reported. The patient was admitted for vaso-occlusive sickle cell crisis and received 4 units of packed RBCs secondary to worsening symptomatic anemia (Hb 5.0 g/dL).

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