| SFI | Sexual Function Index; Social Function Index |
|---|---|
| SFS | serial foveal seizures; skin and fascia stapler; social functioning schedule; spatial frequency spec... |
| SH | Salter-Harris [fracture]; Schonlein-Henoch [purpura]; self-help; serum hepatitis; sexual harassment;... |
| SHMO, S/HMO | social health maintenance organization |
| SI | International System of Units [Fr. le Systeme International d'Unites]; sacroiliac; saline infusion; ... |