| HDPAA | heparin-dependent platelet-associated antibody |
|---|---|
| HELLP | hemolysis, elevated liver enzymes, and low platelet count [syndrome] |
| HGPS | hereditary giant platelet syndrome; Hutchinson-Gilford progeria syndrome |
| HIPA | heparin-induced platelet activation |
| hPL | human placental lactogen; human platelet lactogen |