| Abbreviation | Definition |
|---|---|
| HCID | High Consequence Infectious Diseases |
| HCIRV1 | Human Circovirus 1 |
| HD | Hepatitis Delta |
| HDDC | Harvard Digestive Disease Center |
| HDDC | Harvard Digestive Diseases Center |
| HDF | Hereditary Disease Foundation |
| HDFN | Haemolytic Disease of the Fetus and Newborn |
| HDFN | Hemolytic Disease of the Fetus and Newborn |
| HDN | Hemolytic Disease of Newborn |
| HDN | Hemolytic disease of the newborn |
| HDPI | Heart Disease Predictive Instrument |
| HDPS | Heart Disease Predict System |
| HDRC | Hirschsprung Disease Research Collaborative |
| HDRD | Heart Disease Related Death |
| HDS | Hypertension in Diabetes Study |
| HDSA | Huntington Disease Society of America |
| HDSA | Huntington's Disease Society of America |
| HDSP | Heart Disease and Stroke Prevention |
| HDSS | Hyperhidrosis Disease Severity Scale |
| HE | Hepatitis E |