| Abbreviation | Term(s) |
| HB | Hemoglobin |
| HCG | Human chorionic gonadotropin |
| HCT | Hematocrit |
| HCVD | Hypertensive cardiovascular disease |
| HD | Heart disease |
| HEENT | Head, eyes, ears, nose & throat |
| HER2 | Human Epidermal Receptor #2 |
| HGB | Hemoglobin |
| HIV | Human immunodeficiency virus |
| HN2 | Nitrogen mustard |
| H2O | Water |
| H/O | History of |
| HORM | Hormone |
| HOSP | hospital |
| H&P | History and physical |
| HPF | High power field |
| HPI | History of present illness |
| HPV | Human papilloma virus |
| HR(S) | Hour(s) |
| HTLV-III | Human T-lymphotrophic virus type III |
| HVD | Hypertensive vascular disease |
| HX | History |
| HYST | Hysterectomy |