| Abbreviation | Definition |
|---|---|
| TSP | Thoracic SPine |
| TSS | Toxic Shock Syndrome |
| TSST-1 | Toxic Shock Syndrome Toxin number 1 |
| TST | TectoSpinal Tract |
| TST | Triceps Skin-fold Thickness |
| TST | Tuberculin Skin Test |
| TT | Tactile Tension |
| TT | Thrombin time |
| TT | Too Tight |
| TT | Total Time |
| TT | transit time |
| TT | Treatment Technique |
| TT | Tympanotomy Tubes |
| TTD | Temporary total disability |
| TTFL | transcription-translation feedback loop |
| TTH | Tension Type Headache |
| TTH | Thyrotropic Hormone |
| TTM | TrichoTilloMania |
| TTN | Transient Tachypnea of the Newborn |
| TTO | TransTracheal Oxygen |