| SoP | standard of performance |
|---|---|
| SPD | schizotypal personality disorder; sociopathic personality disorder; specific paroxysmal discharge; s... |
| SPF | skin protection factor; specific-pathogen free; spectrophotofluorometer; S-phase fraction; split pro... |
| SPMR | standard proportionate mortality ratio (or rate) |
| SRM | spontaneous rupture of membranes; Standard Reference Material; superior rectus muscle |