| sEP | single evoked potential |
|---|---|
| SFAP | single-fiber action potential |
| SFEMG | single fiber electromyography |
| SI | International System of Units [Fr. le Systeme International d'Unites]; sacroiliac; saline infusion; ... |
| SID | single intradermal [test]; Society for Investigative Dermatology; sucrase-isomaltase deficiency; sud... |