September 14, 2026 · BJOG : an international journal of obstetrics and gynaecology · DOI: 10.1111/1471-0528.70326

Population Prevalence and Incident HPA-1a Alloimmunisation in Pregnancy: A Prospective, Multi-Ethnic, Natural History Study

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The authors aimed to determine the prevalence of higher risk for HPA-1a alloimmunisation and the development of foetal-neonatal alloimmune thrombocytopaenia (FNAIT) among a diverse cohort of pregnant women. The study found that only 1.7% of participants were of the HPA-1b/1b genotype, with a small percentage of those at higher risk developing anti-HPA-1a antibodies post-partum, highlighting the rarity of this condition and its varying prevalence among different racial and ethnic groups.

Vasilis Sitras, Emilie Vander Haar, Russell Miller, Gwen Allen, Sara Alson, Roisin Armstrong, Dawn Black, Michael P Bombara, David Dhanraj, Akash Gupta, Laura Hart, Katherine Kohari, Laura E Lawrence, Helena Litorp, Hector Mendez-Figueroa, Surabhi Nanda, Michael Paidas, Kristy Palomares, Robin Perry, Romy Pothof, Ekkehard Schleussner, Daniel Skupski, Eva Wiberg-Itzel, Shauna F Williams, Heidi Tiller, Joanne Verweij, James B Bussel

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