| Abbreviation | Term(s) |
| Fahrenheit | F |
| Family (medical) history | F(M)H |
| Fasting blood sugar | FBS |
| Fever unknown origin | FUO |
| Fingerbreadth | FB |
| First dorsal vertebra, second dorsal vertebra, etc. | D1, D2, etc. |
| Flat plate | FP |
| Floor of mouth | FOM |
| Fluorescence in situ hybridization | FISH |
| Fluoroscopy | FLURO |
| Follow up | FU |
| Fracture | FX |
| Frozen section | FS |