| Abbreviations | Meaning |
 | SNIVT | Society Of Non-Invasive Vascular Technology |
| SNM | Society Of Nuclear Medicine; Sulfanilamide |
| SNMA | Student National Medical Association |
| SNMT | Society Of Nuclear Medical Technologists |
| SNS | Senior Nursing Sister; Society Of Neurological Surgeons; Supplementary Nursing System; Sympathetic Nervous System |
| SOA | Southern Orthopaedic Association |
| SOBCOT | Société Royale Belge De Chirurgie Orthopédique Et De Traumatologie (Belgian Society Of Orthopaedics And Traumatology) |
| SOCITRAS | Societa Italiana Di Traumatologia Della Strada (Italian Society Of Road Traumatology) |
| SOF | Study Of Osteoporotic Fractures [in Association With Strokes]; Superior Orbital Fissure |
| SOFCOT | French Society Of Orthopaedics And Trauma Surgery |
| SOFIGO | The International Association Of Supporters Of FIGO |
| SOMA | Student Osteopathic Medical Association; Subjective, Objective, Management, And Analytic [scale] |
| SOMOS | Society Of Military Orthopaedic Surgeons (AAOS) |
| SOPHE | Society For Public Health Education |
| SOSA | Student Osteopathic Surgical Association |
| SPCA | Society For Prevention Of Cruelty To Animals |
| SPIE | International Society For Optical Engineering |
| SPR | Society For Pediatric Radiology |
| SPR | Society For Pediatric Research |
| SPS | Society Of Pelvic Surgeons |
| SPU | Short Procedure Unit; Society Of Pediatric Urology; Standardized Photometric Unit |
| SRD | Society For The Relief Of Distress |
| SRD | Society For The Right To Die |
| SRP | Society For Radiological Protection |
| SRS | Scoliosis Research Society (also: AAOS Specialty Societies) |
| SSE | Spine Society Of Europe |
| SSHM | Society For The Social History Of Medicine [UK] |
| SSO | Sequence-specific Oligonucleotide [probe]; Society Of Surgical Oncology; Special Sense Organ |
| SSP | Scottish Society Of Physicians |
| STEM | Scanning Transmission Electron Microscope; Society Of Teachers Of Emergency Medicine |
| STFM | Society Of Teachers Of Family Medicine |
| STS | Society Of Thoracic Surgeons |
| STSA | Southern Thoracic Surgical Association |
| SVS | Slit Ventricle Syndrome; Society For Vascular Surgery |
| TAANOS | The American Academy Of Neurological And Orthopaedic Surgeons |
| TAC | Trauma Association Of Canada |
| TOA | Texas Orthopaedic Association |
| TSJ | Telemedicine Society Of Japan |
| UAEM | University Association For Emergency Medicine |
| UASA | United Amputee Services Association |
| UKEGNS | United Kingdom Epidemiology Group For The Nutrition Society |
| UNFPA | United Nations Family Planning Association |
| URISA | Urban And Regional Information Systems Association |
| USPTA | United States Physical Therapy Association |
| VACTERL | Vertebral Abnormalities, Anal Atresia, Cardiac Abnormalities, Tracheoesophageal Fistula And/or Esophageal Atresia, Renal Agenesis And Dysplasia, And Limb Defects [association] |
| VHA | Veterans Health Administration; Voluntary Hospital Association |
| VNA | Visiting Nurse Association |
| WAIS | Western Angiographic And Interventional Society |
| WAT | Word Association Test |
| WFPHA | World Federation Of Public Health Associations |
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