| Abbreviation | Definition |
|---|---|
| STR | single twitch response |
| STR | soluble transferrin receptor |
| STR | Specialty Registrar (StR) |
| STR | Structured Training Report |
| STR | subtotal resection |
| STR | superior temporal region |
| STR | supratrigeminal region |
| STR | systolic time ratio |
| STRAP | Specialty Training Assessment Process |
| STRW | Support, Time and Recovery Worker |
| STSS | short term support services |
| STSS | staphylococcal toxic shock syndrome |
| STSS | streptococcal toxic shock syndrome |
| SU | secretory unit |
| SU | single unit |
| SU | solar urticaria |
| SU | substance use |
| SU | sulphonylurea |
| SUDI | sudden unexplained death in infancy/an infant |
| SUI | serious untoward incident (serious incident requiring investigation) |