Abbreviation Meaning s̅ without (s with an overbar) (from Latin sine) S sacrum Sx symptoms surgery (though deemed by some as inappropriate) S1 first heart sound S2 second heart sound S3 third heart sound S4 fourth heart sound S&O salpingo-oophorectomy Sb Scholar batch SAAG serum–ascites albumin gradient SAB staphylococcal bacteremia spontaneous abortion (that is, miscarriage) SAD seasonal affective disorder subacromial decompression SAH subarachnoid hemorrhage SAM systolic anterior motion of the mitral valve Severe acute malnutrition SAN sinoatrial node SaO2 arterial oxygen saturation SAPS II simplified acute physiology score SAPS III simplified acute physiology score SAR seasonal allergic rhinitissub-acute rehabilitation facility Sarc sarcoidosis SARS severe acute respiratory syndrome SB small bowel (see small intestine) SBE subacute bacterial endocarditis SBFT small bowel follow through SBMA spinal and bulbar muscular atrophy SBO small bowel obstruction SBP systolic blood pressure spontaneous bacterial peritonitis SBR Serum Bilirubin SBRT split beam radiation therapy SC Spinal Cord or subcutaneous (from Latin subcutis) SCA spinocerebellar ataxia SCAT sex cord tumor with annular tubes SCC squamous cell carcinoma SCD sequential compression device sickle-cell disease sudden cardiac death SCI spinal cord injury SCID severe combined immunodeficiency SCIWORA spinal cord injury without radiographic abnormality SCLC small cell lung cancer SCN severe congenital neutropenia sickle cell nephropathy superior cluneal nerves suprachiasmatic nucleus scope microscope or endoscope SCT sacrococcygeal tumor SCZ schizophrenia S.D. subdermal SD σ standard deviation SDH subdural hematoma SDTI suspected deep tissue injury SE standard error side effect Sed sedimentation (rate) (see erythrocyte sedimentation rate) SEE syphilis elimination effort Segs segmented cells SEM standard error of the mean systolic ejection murmur (see heart murmur) SERM selective estrogen receptor modulator SERT serotonin transporter SFA superficial femoral artery serum folic acid SGA small for gestational age SG cath Swan–Ganz catheter (see pulmonary artery catheter) SG specific gravity (in urinanalysis) SGB stellate ganglion block SGOT serum glutamic oxaloacetic transaminase SGPT serum glutamic pyruvic transaminase SH SHx social history (personal habits, living situation, job) SHBG sex hormone-binding globulin shob shortness of breath (see dyspnea) SHPT secondary hyperparathyroidism SHx surgical history SI International System of Units suicidal ideation seriously ill sacroiliac (joint) STAC Scaffolding theory of cognitive aging SIADH syndrome of inappropriate antidiuretic hormone SICU surgical intensive care unit SIBO small intestinal bacterial overgrowth SID semel in die meaning once daily. Used only in veterinary medicine. SIDS sudden infant death syndrome SIL squamous intraepithelial lesion SIMV synchronized intermittent mechanical ventilation si op. sit if needed (from Latin si opus sit) SIRS systemic inflammatory response syndrome SIT stress inoculation training (see posttraumatic stress disorder) SJS Stevens–Johnson syndrome SK streptokinase sl sublingual SLD speech and language disorder SLE systemic lupus erythematosus SLEV St Louis virus SLL small lymphocytic lymphoma SLN sublingual nitroglycerin SLNSLNB sentinel lymph node biopsy SLP speech-language pathologist SLR straight leg raise (see Lasègue's sign) SM multiple sclerosis (from Latin sclerosis multiplex) submucosal Skeletal Muscle SMA sequential multiple analysis superior mesenteric artery spinal muscle atrophy SMA-6 six-channel serum multiple analysis SMA-7 serum metabolic assay SMN statement of medical necessity SMS senior medical student SMT spinal manipulative therapy SMV superior mesenteric vein SN student nurse skilled nursing SNB sentinel node biopsy (ductal carcinoma) SNF skilled nursing facility SNHL sensorineural hearing loss SNP sodium nitroprusside single nucleotide polymorphism SNRI serotonin–norepinephrine reuptake inhibitor SNV sin nombre virus (the most common type of hantavirus) single nucleotide variant SO salpingo-oophoritis SOA swelling of ankles SOAP subjective, objective, assessment, plan (how physicians’ notes may be organized) SOB shortness of breath (see dyspnea) SOBOE shortness of breath on exertion SOD sphincter of Oddi dysfunction SOL space-occupying lesion Sol solution SOOB send out of bed sitting out of bed SOP sterile ophthalmic preparation SORA stable on room air SOS if needed (from Latin si opus sit) SP s/p status post; condition after" SPE streptococcal pyrogenic exotoxin Spec specimen SPECT single-photon emission computed tomography SPEP serum protein electrophoresis SPET single-photon emission tomographyspp.species, as in bacterial species (e.g. Enterobacteriaceae spp.) Sp. fl. spinal fluid (see cerebrospinal fluid) Sp. gr. specific gravity SPS single point (walking) stick SQ sq subcutaneous SR slow release (see also time release technology (medicine))Sinus rhythm SpO2 peripheral capillary oxygen saturation SROM spontaneous rupture of membranes SRS stereotactic radiotherapy sex reassignment surgery SRU shock resuscitation unit ssss one-half (ss either with or without a bar over them) (from Latin semis) SS hemoglobin SS (HbSS) (see in sickle-cell disease = SS disease) subserosal Sjogren's Syndrome S/S S/Sx signs and symptoms SSC secondary sex characteristics SSE sterile speculum exam SSEP somatosensory evoked potential SSI sliding scale insulin SSKI potassium iodide solution SSPE subacute sclerosing panencephalitis ssRNA single-stranded RNA SSRI selective serotonin reuptake inhibitor SSSI skin and skin structure infection (also referred to as acute bacterial skin and skin structure infection - ABSSSI) SSSS staphylococcal scalded skin syndrome SSS sick sinus syndrome ST sore throat speech therapy Staph. Staphylococcus STD sexually transmitted disease stat immediately (from Latin statim) STEC Shiga toxin–producing Escherichia coli (another name for enterohemorrhagic E. coli) STEMI ST elevation myocardial infarction STH somatotropic hormone STI sexually transmitted infection soft tissue injury STN Subthalamic nucleus soft tissue neck STNR Symmetrical tonic neck reflex STOP surgical termination of pregnancy (sometimes suction termination of pregnancy) Strep. Strepto. Streptococcus STS serological test for syphilis soft tissue sarcoma Subq subcutaneousSUDsubstance use disorder SUI stress urinary incontinence Supp suppository SUV standardized uptake value Sux Suxamethonium chloride (Succinylcholine) SV seminal vesicle stroke volume SVC superior vena cava SVD spontaneous vaginal delivery simple vertex delivery SVE sterile vaginal examination SVG Saphenous vein graft SVI systemic viral infection SVN small volume nebulizer SVR systemic vascular resistance SVT supraventricular tachycardia SW Sturge–Weber syndrome Sx symptoms SXA single-energy X-ray absorptiometer SXR skull x-ray Sz seizure

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