Neonatal alloimmune thrombocytopenia due to an antibody against a labile component of human platelet antigen‐3b (Bakb)

• DOI: 10.1111/j.1365-3148.2004.00537.x
• Publication Date: 2004-11-29T09:47:49Z
• Authors: S. Kataoka; H. Kobayashi; K. Chiba; M. Nakamura; S. Shinada; S. Morita; M. Lin; Y. Shibata
• Keywords: Blood Platelets; Male; Purpura, Thrombocytopenic, Idiopathic; Platelet Function Tests; Infant, Newborn; Infant, Newborn, Diseases; 3. Good health; 03 medical and health sciences; 0302 clinical medicine; Humans; Antigens, Human Platelet; Female; Intracranial Hemorrhages; Autoantibodies

Summary. We report the second case of neonatal alloimmune thrombocytopenia due to anti‐human platelet antigen (HPA)‐3b (Bakb) antibody. The infant was severely affected with intracranial haemorrhage. Most importantly, we were able to detect this antibody only by using fresh, unfixed platelets as antigen. This antibody was detectable neither by conventional mixed passive haemagglutination, platelet immunofluorescence test using fixed platelets, nor by monoclonal antigen immobilization of platelet antigen assay using solubilized platelets. We assume that this antibody reacts only with fresh platelets and that the antigen is a labile component of HPA‐3b (Bakb).