BRa (HPA-5b) incompatibility may cause thrombocytopenia in neonates of mothers with immune thrombocytopenic purpura.


Journal Article

PURPOSE:The association of anti-Br(a) immunoglobulin G (IgG) platelet alloantibodies with the development of thrombocytopenia in neonates of mothers with autoimmune thrombocytopenic purpura (ITP) is reported. METHODS:Between March 1994 and July 1997, 28 consecutive pregnant women with ITP seen at New York Hospital were screened for platelet-reactive antiglycoprotein (glycoprotein [GP] IIb/IIIa, Ib/IX, and Ia/IIa) antibodies. RESULTS:The sera from 6 of these 28 women contained IgG alloantibodies to GP Ia/IIa directed against the Br(a) (HPA-5b) antigen. Only three families each had at least one Br(a)+ and at least one Br(a)- infant. Platelet typing in these families revealed that the mothers were Br(b/b) (Br(a)-) and the fathers were Br(a/b) (Br(a)+). Platelet counts < 100,000/microl occurred only in 2 of the 3 infants who were Br(a)+. The platelet counts were significantly lower in the three Bra+ infants compared to the five Br(a)- infants (p = 0.038). CONCLUSION:Platelet alloimmunization with anti-Br(a) can cause neonatal thrombocytopenia in infants of mothers with ITP. Platelet antibody testing in the pregnant women with ITP is recommended.

Full Text

Cited Authors

  • Gururangan, S; McFarland, JG; Cines, DB; Skupski, D; Bussel, JB

Published Date

  • May 1998

Published In

Volume / Issue

  • 20 / 3

Start / End Page

  • 202 - 206

PubMed ID

  • 9628430

Pubmed Central ID

  • 9628430

Electronic International Standard Serial Number (EISSN)

  • 1536-3678

International Standard Serial Number (ISSN)

  • 1077-4114

Digital Object Identifier (DOI)

  • 10.1097/00043426-199805000-00004


  • eng