| Abbreviation | Definition |
|---|---|
| AT | atrial tachycardia |
| AT | atrophic thyroiditis |
| AT | autogenic training |
| AT | autoimmune thrombocytopenia |
| AT | autoimmune thyroiditis |
| AT | autologous transfusion |
| AT | autologous transplantation |
| AT | axillary temperature |
| ATK | appraisal tool kit |
| ATK | autologous tumour killing |
| ATLS | acute tumour lysis syndrome |
| ATMD | Association of Trust Medical Directors |
| ATP | according to protocol |
| ATP | Acute Tonsilar pharyngitis |
| ATP | advanced test in psychology |
| ATP | ambient temperature and pressure |
| ATP | Association for Teaching Psychology |
| ATP | Association for Transpersonal Psychology |
| ATP | authority to proceed |
| ATP | autoimmune thrombocytopaenia |