| Abbreviation | Definition |
|---|---|
| SIS | Susceptible Infective Susceptible |
| SIT | Situational |
| SITO | Sonograms In The Office |
| SIU | Stimulus Isolation Unit |
| SIV | Simian Immunodeficiency Virus |
| SIW | Self inflicted wound |
| SIW | Self-Inflicted Wound |
| SJW | St. John's Wort |
| SK | Skeletal |
| SKL | Skeletal Strength |
| SKN | Skin |
| SKP | Seventeen Kilodalton Protein |
| SKQ | Sexual Knowledge Questionnaire |
| SL | Sensation Level |
| SL | Sensory Level |
| SL | Sublingual |
| SL | Sub-Lingual |
| SLAP | Superior Labral Anterior Posterior |
| SLAP | Superior, Labrum, Anterior, Posterior |
| SLB | Short leg brace |