| Abbreviation | Interpretation | 
| SO | salpingo-oophorectomy | 
| sex offender | |
| shoulder orthosis | |
| superior oblique | |
| standing orders | |
| second opinion | |
| SOA | seen on arrival | 
| serum opsonic activity | |
| symptoms of asthma | |
| swelling of ankles | |
| SOB | shortness of breath | 
| SOC | Stages of Change | 
| standard of care | |
| Sense of Coherence scale | |
| state of consciousness | |
| SOD | sphincter of Oddi | 
| sinovenous occlusive disease (intracranial) | |
| Statement of Deficiency | |
| Sphincter of Oddi dyskinesia | |
| SODA | Severity of Dyspepsia Assessment | 
| SOFA | Sequential Organ Failure Assessment | 
| sepsis-related organ failure assessment | |
| SOH | sympathetic orthostatic hypotension | 
| SOI | severity of illness | 
| slipped on ice | |
| SOL | solution / soluble | 
| sleep onset latency | |
| signs of life | |
| space-occupying lesion(s) | |
| SOM | secretory otitis media | 
| superior oblique muscle | |
| somatotropin / somatostatin | |
| SONA | sonogram | 
| SOOL | spontaneous onset of labor | 
| SOP | Scope of Practice | 
| sensory organ precursor | |
| standard operating procedure | |
| SOR | Standards, Options and Recommandations | 
| stratified odds ratio | |
| suppurative otitis, recurrent | |
| SOS | Stent or Surgery | 
| if necessary | |
| stimulation of senses | |
| SOT | solid organ transplant | 
| sacro-occipital technique | |
| squamous odontogenic tumor | |
| SP | standard procedure/practice | 
| standardized patient | |
| Sleep Paralysis | |
| sequential pulse | |
| soft palate | |
| serum protein | |
| saturation pressure | |
| species | |
| systolic pressure | |
| S/P | status post | 
| SPA | salt-poor albumin | 
| spondyloarthropathy | |
| scintillation proximity assay | |
| small pulmonary artery | |
| subperiosteal abscess | |
| SPBI | serum protein bound iodine | 
| SPC | single point cane | 
| second primary cancer | |
| salivary protein complex | |
| SPD | Schizotypal personality disorder | 
| storage pool deficiency | |
| sterile processing department | |
| Severe personality disorder | |
| sociopathic personality disorder | |
| spasmodic | |
| SPE | Streptococcal pyrogenic exotoxin | 
| serum protein electrophoresis | |
| severe preeclampsia | |
| Standardized Practical Equipment | |
| SPF | Sun Protection Factor | 
| Specific Pathogen Free | |
| S-phase fraction | |
| standard perfusion fluid | |
| SPG | Specific gravity | 
| splenoportography | |
| sponge | |
| spastic paraplegia | |
| SPH | spheroid | 
| severely and profoundly handicapped | |
| secondary pulmonary hypertension | |
| SPI | subclinical papillomavirus infection | 
| selective protein index | |
| Self-Perception Inventory | |
| Standardized Psychiatric Interview | |
| SPK | superficial punctate keratopathy | 
| simultaneous pancreas-kidney transplantation | |
| SPL | serum prolactin level | 
| splanchnic | |
| superior parietal lobule | |
| spontaneous lesion | |
| SPM | Statistical parametric mapping | 
| salpingopharyngeus muscle | |
| second primary malignancies | |
| shocks per minute | |
| SPN | solitary pulmonary nodule | 
| Second primary neoplasms | |
| sympathetic preganglionic neuron | |
| superficial peroneal nerve | |
| Streptococcus pneumoniae | |
| spontaneous nystagmus | |
| SPP | species | 
| suprapubic prostatectomy | |
| skin perfusion pressure | |
| SPQ | Schizotypal Personality Questionnaire | 
| SPR | Sprain | 
| skin potential reflex | |
| scanned projection radiography | |
| spectroscopy | |
| SPS | Social Phobia Scale | 
| simple partial seizure | |
| Suicide Probability Scale | |
| sodium polystyrene sulfonate | |
| status post surgery | |
| shoulder pain and stiffness | |
| SPT | spontaneous pneumothorax | 
| sleep period time | |
| second primary tumor | |
| skin prick test | |
| spinal tap | |
| SPU | short procedure unit | 
| SQ | subcutaneous | 
| Symptom Questionnaire | |
| squamous cell carcinoma | |
| squamous | |
| Sleep quality | |
| SSQM | Squamous metaplasia | 
| SQUID | ssuperconductive quantum interference device | 
| SQV | saquinavir | 
| SR | sinus rhythm | 
| sedimentation rate | |
| secretion rate | |
| strontium | |
| systemic resistance | |
| sustained release | |
| SRA | serum renin activity | 
| serotonin release assay | |
| SRC | Sarcomatoid renal carcinoma | 
| spontaneous rhythmic contractions | |
| scleroderma renal crisis | |
| SRD | serous retinal detachment | 
| service-related disability | |
| substance-related disorder | |
| SRE | Schedule of Recent Events | 
| skeletal-related events | |
| SRF | skin reactive factor | 
| severe renal failure | |
| somatotropin releasing factor | |
| SRH | stigmata of recent hemorrhage | 
| signs of recent hemorrhage | |
| single radial hemolysis | |
| sexual and reproductive health | |
| SRI | serotonin reuptake inhibitor | 
| severe renal insufficiency | |
| SRM | spontaneous rupture of membranes | 
| standardized response mean | |
| superior rectus muscle | |
| SRP | scaling and root planing | 
| SRR | standardized rate ratio | 
| surgical recovery room | |
| skin resistance response | |
| SRS | sex reassignment surgery | 
| slow reacting substance | |
| schizophrenic residual state | |
| Silver-Russell syndrome | |
| SRT | sedimentation rate test | 
| simple reaction time | |
| Speech recognition threshold | |
| Symptom Rating Test | |
| SRU | Stroke Rehabilitation Unit | 
| side rails up | |
| SS | Single-Strength | 
| signs and symptoms | |
| Sliding Scale | |
| saline solution | |
| standard score | |
| seizure-sensitive | |
| short stature | |
| one-half | |
| SSA | skin sympathetic activity | 
| skin-sensitizing antibody | |
| social security act | |
| SSBP | sitting systolic blood pressure | 
| SSC | systemic sclerosis | 
| skin-to-skin contact | |
| Size, shape and consistency | |
| Squamous cell carcinoma | |
| SSD | silver sulfadiazine cream | 
| Social Security Disability | |
| source-skin distance | |
| Single Sided Deafness | |
| SSE | soap suds enema | 
| skin self-examination | |
| subacute spongiform encephalopathy | |
| SSF | subscapular skinfold thickness | 
| SSG | split skin graft | 
| sublabial salivary gland | |
| SSHL | sensorineural hearing loss | 
| SSI | sliding scale insulin | 
| severity score index | |
| sensitivity index | |
| strength-strain index | |
| surgical site infection | |
| SSKI | saturated solution of potassium iodide | 
| SSL | second stage of labor | 
| simulated sunlight | |
| steady-state levels | |
| sufficient sleep | |
| SSM | superficial spreading melanoma | 
| skin-sparing mastectomy | |
| SSN | suprasternal notch | 
| sensory neuropathy | |
| Severely subnormal | |
| SSO | short stay observation | 
| Society of Surgical Oncology | |
| SSP | sequence-specific primer | 
| schedule for Schizotypal Personalities | |
| short stay procedure | |
| spontaneous pneumothorax | |
| Scales of Personality | |
| SSQ | social support questionnaire | 
| SSR | steady state response | 
| sympathetic skin response | |
| spontaneous respiratory rate | |
| SSS | sick sinus syndrome | 
| Sepsis Severity Score | |
| subclavian steal syndrome | |
| Septic Severity Score | |
| sterile saline soak | |
| Sleepiness Scale | |
| SST | Sclerosing stromal tumor | 
| serum separator tube | |
| skin and soft tissue | |
| SSU | short stay unit | 
| sterile supply unit | |
| S/SX | signs/symptoms | 
| ST | sinus tachycardia | 
| skin temperature | |
| standard treatment | |
| street | |
| skin test | |
| sore throat | |
| speech therapist | |
| sclerotherapy | |
| surface tension | |
| STA | superficial temporal artery | 
| second trimester abortion | |
| spike-triggered averaging | |
| standard tube agglutination | |
| STAT | immediately / at once / medical emergency | 
| STB | stillborn | 
| STC | serum total cholesterol | 
| specialized treatment center | |
| soft tissure calcification | |
| stroke treatment center | |
| slow transit constipation | |
| STD | sexually transmitted disease | 
| short-term disability | |
| standard deviation | |
| STE | ST-segment elevation | 
| STF | Serum thymic factor | 
| special tube feeding | |
| slip, trip and fall | |
| STG | superior temporal gyrus | 
| serum triglycerides | |
| short-term goals | |
| STH | somatotropic hormone | 
| soft tissue hemorrhage | |
| short-term habituation | |
| STI | sexually transmitted infection | 
| soft tissue injury | |
| STL | Stereolithography | 
| serum testosterone level | |
| STM | scanning tunneling microscope | 
| Salmonella typhimurium | |
| short-term memory | |
| STN | Salmonella enterotoxin | 
| solitary thyroid nodules | |
| STP | Standard temperature and pulse | 
| short-term potentiation | |
| STR | scotopic threshold response | 
| stroke | |
| short tandem repeat | |
| Systolic Time Ratio | |
| STS | serologic test for syphilis | 
| side-to-side | |
| short-term survivors | |
| soft tissue swelling | |
| soft tissue sarcoma | |
| soft tissue swelling | |
| STT | short term test | 
| Schirmer tear test | |
| soft tissue tumor | |
| scapho-trapezio-trapezoid | |
| skin temperature test | |
| STV | short-term variability | 
| spontaneous tidal volume | |
| STX | stricture | 
| SU | sulfonamide / sulfonylurea | 
| stasis ulcer | |
| stroke unit | |
| SUA | serum uric acid | 
| single umbilical artery | |
| SUD | substance use disorder | 
| sudden unexpected death | |
| SUI | stress urinary incontinence | 
| SUN | serum urea nitrogen | 
| SUO | syncope of unknown origin | 
| SUP | stress ulcer prophylaxis | 
| superficial | |
| supine position | |
| suppuration | |
| supination | |
| SUPP | suppository | 
| SUR | standard uptake ratio | 
| survival | |
| SUSP | suspension | 
| SUV | standard uptake value | 
| SUX | succinylcholine | 
| SUZI | subzonal injection | 
| SV | stroke volume | 
| seminal vesicles | |
| saphenous vein | |
| sigmoid volvulus | |
| single ventricle | |
| single vessel | |
| saphenous veins | |
| SVA | sagittal vertical axis | 
| supraventricular arrhythmia | |
| SVB | saphenous vein bypass | 
| SVC | slow vital capacity | 
| superior vena cava | |
| SVD | Small/single vessel disease | 
| structural valve degeneration | |
| spontaneous vaginal delivery | |
| SVE | sterile vaginal examination | 
| stroke volume echo | |
| saline volume expansion | |
| SVG | saphenous vein graft | 
| SVH | subjective visual horizontal | 
| saphenous vein harvesting | |
| SVI | stroke volume index | 
| severely visually impaired | |
| seminal vesicle invasion | |
| SVL | superficial vastus lateralis | 
| SVN | small-volume nebulizer | 
| SVO | small vessel occlusion | 
| splenic vein occlusion | |
| SVP | small volume parenteral | 
| systemic venous pressure | |
| SVR | systemic vascular resistance | 
| stroke volume ratio | |
| supraventricular rhythm | |
| SVT | Supraventricular Tachycardia | 
| Sustained Ventricular Tachycardia | |
| subclavian vein thrombosis | |
| SVZ | subventricular zone | 
| SW | Social Worker | 
| sterile water | |
| shock wave | |
| stab wound | |
| SWD | short wave diathermy | 
| SWFI | sterile water of injection | 
| SWL | shock wave lithotripsy | 
| SWOT | Strengths, Weaknesses/Limitations, Opportunities, and Threats (involved in a project or in a business venture) | 
| SWS | social work service | 
| slow-wave sleep | |
| sex workers | |
| Sturge-Weber syndrome (encephalotrigeminal angiomatosis) | |
| steroid-wasting syndrome | |
| SWT | systolic wall thickening | 
| SWU | septic work-up | 
| SX | symptoms | 
| signs | |
| surgery | |
| SXA | single-energy x-ray absorptiometry | 
| SXR | skull x-ray | 
| steroid and xenobiotic receptor | |
| SYN | synovial | 
| synergistic | |
| synapse | |
| syndrome | |
| SYPH | syphilis | 
| SZ | schizophrenia | 
| seizure | |
 
