| IOFB | intraocular foreign body |
|---|---|
| IUFB | intrauterine foreign body |
| KB | human oral epidermoid carcinoma cells; Kashin-Bek [disease]; ketone body; kilobyte; Kleihauer-Betke ... |
| Ke | exchangeable body potassium |
| LA50 | total body surface area of burn that will kill 50% of patients (lethal area) |