| 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 |