| SHT | Schädel-Hirn-Trauma |
| SHT | Spalthauttransplantat |
| SIADH | Syndrom der inadäquaten ADH-Sekretion |
| SIDS | Sudden Infant Death Syndrome |
| sIg | surface immunoglobulin (BZR) |
| signa | Rezept: bezeichne (+Gebrauchsanweisung für Patient) (s.) |
| SIMV | synchronized intermittend mandatory ventilation |
| sin. | Sinister |
| sine confectione | Rezept: in neutraler Verpackung |
| SIRS | systemic inflammatory response syndrome |
| SIV | Simian Immuno-deficiency Virus |
| SK | Streptokinase |
| SKS | Sonorer Klopfschall |
| s.l. | sublingual |
| SLA | soluble liver antibody |
| SLAP | Superior Labrum Anterior (to) Posterior Läsion |
| SLE | systemischer Lupus erythematodes |
| SLE | St. Louis Enzephalitis |
| SLO | Scanning-Laser-Ophthalmoskop |
| SLS | Schallleitungsschwerhörigkeit |
| SLSH | Schallleitungsschwerhörigkeit |
| SLT | Shiga-like-toxin |
| SM | (Herz-) Schrittmacher |
| SMA | smooth muscle antigen |
| SMA | sequential multiple analyzer |
| SMMS | Short-Mini-Mental-State-Test |
| SMRT | Section for Magnetic Resonance Technologists" |
| SNAP | sensibles Nervenantwortpotenzial |
| SND | striatonigrale Degeneration |
| SNM | Society of Nuclear Medicine" |