| Abbreviation | Meaning |
| H&P | history and physical |
| Hct | hematocrit |
| HCI | hydrochloric acid |
| HCVD | hypertensive cardiovascular disease |
| Hgb | hemoglobin |
| HI | head injury |
| HOB | head of bed |
| ht | height |
| HTN | hypertension |
| Hx | history |
| ICU | intensive care unit |
| I&D | incision and drainage |
| IM | intramuscular |
| inj | injection |
| int & ext | internal and external |
| I&O | intake and output |
| IP | inpatient |
| IPPB | intermittent positive pressure breathing |
| IT | inhalation therapy |
| IUD | intrauterine device |
| IV | intravenous |
| IVP | intravenous pyelogram |
| K+ | potassium |
| KJ | knee jerk |
| KUB | kidney, ureter and bladder |
