Maternal human platelet antigen‐1a antibody level correlates with the platelet count in the newborns: a retrospective study

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Abstract
Maternal plasma and/or serum levels of anti-HPA-1a at delivery were compared to neonatal platelet (PLT) counts. Samples from HPA-1bb women who gave birth to children with thrombocytopenia or had anamnestic information about a previous child with neonatal alloimmune thrombocytopenia (NAIT) were collected at delivery. A modified monoclonal antibody immobilization of PLT antigen method was used for quantification of anti-HPA-1a. The anti-HPA-1a level in women with severely thrombocytopenic children was higher than the corresponding level in mothers of children born with moderate thrombocytopenia or normal PLT counts. Our data show a significant correlation between maternal anti-HPA-1a level and the neonatal PLT count and indicate strongly that this may be a reliable predictive measure for NAIT. Suitable test systems for quantitative measurements of anti-HPA-1a must be developed and evaluated for this particular purpose.