Neonatal alloimmune thrombocytopenia due to anti-HPA-2b (anti-Koa)

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Immunohematology

American National Red Cross

Subject: Medical Laboratory Technology

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ISSN: 0894-203X
eISSN: 1930-3955

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VOLUME 19 , ISSUE 2 (June 2003) > List of articles

Neonatal alloimmune thrombocytopenia due to anti-HPA-2b (anti-Koa)

Mindy Goldman / Élise Trudel / Samir Khalife / Gwendoline M. Spurll

Keywords : neonatal thrombocytopenia purpura, NAIT, anti-HPA-2b, anti-Koa

Citation Information : Immunohematology. Volume 19, Issue 2, Pages 43-46, DOI: https://doi.org/10.21307/immunohematology-2019-473

License : (Transfer of Copyright)

Published Online: 14-October-2020

ARTICLE

ABSTRACT

Most severe cases of neonatal alloimmune thrombocytopenia (NAIT) are due to anti-HPA-1a (anti-PlA1) antibodies. We report a case of NAIT due to anti-HPA-2b that resulted in in utero intracranial hemorrhage.A 33-year-old G2P1A0 Caucasian woman had a routine ultrasound at 34 weeks. The fetus appeared to have a left hemispheric hematoma. IVIG, 1g/kg, was started immediately and administered weekly until delivery. One day after receiving the first dose of IVIG, fetal platelet count was 18 × 109/L, and Hb was 116 g/L. Eleven mL of matched platelets compatible by monoclonal antibody immobilization of platelet antigens (MAIPA) assay were transfused in utero, raising the platelet count to 62 × 109/L. Repeat transfusions were done later that week and 1 week later, with pretransfusion counts of 19 × 109/L and 16 × 109/L, respectively. Delivery by C section was done at 35.5 weeks, after the third platelet transfusion. Platelet count at birth was 77 × 109/L. Drainage of the hematoma was performed after transfusion. Testing with a solid phase ELISA revealed reactivity against GP1b/IX. MAIPA testing after platelet treatment with the protease inhibitor leupeptin demonstrated the presence of anti-HPA-2b. On PCR-SSP the mother was HPA-2a homozygous, the father was HPA-2a/2b. Antibodies against the HPA-2b antigen located on the GP1b/IX complex have been reported in rare cases of NAIT. Testing is complicated by proteolytic degradation of the antigen-bearing fragment. Compatible platelets are easily found since approximately 85 percent of donors are HPA-2a/2a.

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