18.3 Donor testing - Platelet immunology
18.3.1: HPA typing
Donors whose products may be used for fetal or neonatal transfusions should be HPA typed twice using samples collected on different occasions. Further HPA typing at subsequent donations is not required after a confirmed type has been established. HPA typing of other donors need only be performed on 1 occasion and HPA-selected products may be issued on the basis of this 'unconfirmed' type.
18.3.2: Investigation of HPA antibodies
HPA antibody specificities should only be assigned when the sample investigated has been tested and a minimum of 3 positive and 3 negative reactions obtained. An antibody report can be issued at this stage. A donor with an HPA antibody should receive an HPA antibody card and an information leaflet, where this is available. However, before an HPA antibody card and information leaflet is issued, the donor should be typed and found negative for that antigen.
Last updated on 4 September 2023