[ S ]

• S  apparent power; in electrocardiography, a negative deflection that follows an R wave [wave]; entropy; exposure time; half [Lat. semis]; left [Lat. sinister]; mean dose per unit cumulated activity; the midpoint of the sella turcica [point]; sacral; saline; Salmonella; saturated; scanning [pacemaker]; Schistosoma; schizophrenia; scleral [tumor invasion]; second; section; sedimentation coefficient; sella [turcica]; semilente [insulin]; senile, senility; sensation; sensitivity; septum; serine; serum; serum marker; Shigella; siderocyte; siemens; sigmoid; signature [prescription]; silicate; slope; single; slow accelerator; small; smooth [colony]; soft [diet]; solid; soluble; solute; sone [unit]; space; spatial; specificity; spherical; Spirillum; spleen; spontaneous; standard normal deviation; Staphylococcus; stem [cell]; stimulus; Streptococcus; streptomycin; subject; subjective findings; substrate; sulfur; sum of an arithmetic series; supravergence; surface; surgery; suture; Svedberg [unit]; swine; Swiss [mouse]; synthesis; systole; without [Lat. sine]
• S0  scleral invasion not assessed [TNM (tumor-node-metastasis) classification]
• S₁  first stimulus
• s^-1  per second
• S1-S5  first to fifth sacral nerves
• S₁-S₄  first to fourth heart sounds
• S2  supernatant, pure
• s²  sample variance [statistics]
• 4S  Scandinavian Simvastatin Survival Study Group
• S-100  marker protein for peripheral nervous system tumors containing α and β chains
• s  atomic orbital with angular momentum quantum number 0; distance; left [Lat. sinister]; length of path; sample standard deviation; satellite [chromosome]; scruple; second; section; sedimentation coefficient; sensation; series; signed; suckling
•   specific heat capacity; without [Lat. sine]
• s^-1  cycles per second
• s²  sample variance
• Σ  see sigma
• σ  see sigma
• SA  sacro-anterior; salicylamide; salicylic acid; saline [solution]; salt added; sarcoidosis; sarcoma; scalenus anticus; secondary amenorrhea; secondary anemia; secondary arrest; self-administration; self-agglutination; self-analysis; semen analysis; sensitizing antibody; serratus anterior [muscle]; serum albumin; serum aldolase; sexual abuse; sexual addict; sexual assault; short acting; short axis; sialic acid; sialoadenectomy; signal averaged [ECG]; sim-ian adenovirus; simulated annealing [algorithm]; sinoatrial; sinus arrest; sinus arrhythmia; skeletal age; skin-adipose [unit]; sleep apnea; slightly active; slowly adapting [receptor]; soluble in alkaline medium; Spanish American; specific activity; spectrum analysis; sperm abnormality; spiking activity; spinal abscess; spinal anesthesia; splenic artery; stable angina; standard accuracy; Staphylococcus aureus; status asthmaticus; stimulus artifact; Stokes-Adams [syndrome]; streptavidin; subarachnoid; substance abuse; succinylacetone; suicide alert; suicide attempt; surface antigen; surface area; surgery and anesthesia; surgical assistant; suspended animation; suspicious area; sustained action; sympathetic activity; symptom analysis; synthetic aperture; system administrator; systemic aspergillosis
• S-A  sinoatrial; sinoauricular
• S&A  sickness and accident [insurance]; sugar and acetone
• S/A  stent-to-artery [ratio]
• Sa  the most anterior point of the anterior contour of the sella turcica [point]; saline; Staphylococcus aureus
• sA  statampere
• SAA  serum amyloid A; serum amyloid-associated [protein]; severe aplastic anemia; starch ampicillin agar
• SAAP  selective aortic arch perfusion
• SAAQ  signal averaged acoustic quantification
• SAARD  slow-acting antirheumatic drug
• SAAS  Substance Abuse Attitude Survey
• SAAST  self-administered alcohol screening test
• SAB  Scientific Advisory Board; serum albumin; signal above baseline; significant asymptomatic bacteriuria; sinoatrial block; Society of American Bacteriologists; spontaneous abortion; subarachnoid block
• SAb  spontaneous abortion
• SABER  Stent-assisted Balloon Angioplasty and Its Effects on Restenosis [study]
• SABOV  Sabo virus
• SABV  Saboya virus
• SABP  spontaneous acute bacterial peritonitis; systolic arterial blood pressure
• SAC  saccharin; sacrum; screening and acute care; seasonal acute conjunctivitis; Self-Assessment of Communication [scale]; serum aminoglycoside concentration; short-arm cast; sideline assessment of concussion; small accessory chromosome; social activity [scale]; splinting for acute closure; stable access cannula; stretch-activated channel [heart contraction]; subarea advisory council; substance abuse counselor; symptomatic anomaly complex
• SAC_cat  stretch-activated channel-cations [heart contraction]
• sacch  saccharin
• SACD  subacute combined degeneration
• SACE  serum angiotensin-converting enzyme
• SACH  small animal care hospital; solid ankle cushioned heel
• SACK  suppression of asymmetric cell kinetics
• SACNAS  Society for the Advancement of Chicanos and Native Americans in Science
• SaCO₂  alveolar carbon dioxide saturation
• SACS  secondary anticoagulation system
• SACSF  subarachnoid cerebrospinal fluid
• SACT  sinoatrial conduction time
• SAD  Scale of Anxiety and Depression; seasonal affective disorder; Self-Assessment Depression [scale]; sino-aortic denervation; small airway disease; source-to-axis distance; sugar, acetone, and diacetic acid; suppressor-activating determinant
• SADD  Short-Alcohol Dependence Data [questionnaire]; standardized assessment of depressive disorders; Students Against Drunk Driving
• SADDAN  severe achondroplasia with developmental delay and acanthosis nigricans
• SADIA  small angle double incidence angiography
• SADL  simulated activities of daily living
• SADR  suspected adverse drug reaction
• SADS  Schedule for Affective Disorders and Schizophrenia; self-accelerating decomposition temperature; Sudden Adult Death Survey; sudden arrhythmic death syndrome
• SADS-C  Schedule for Affective Disorders and Schizophrenia-Change
• SADS-L  Schedule for Affective Disorders and Schizophrenia-Lifetime
• SADT  Stetson Auditory Discrimination Test
• SAdV  simian adenovirus
• SAE  serious adverse event; sexual assault evaluation; short above-elbow [cast]; specific action exercise; subcortical arteriosclerotic encephalopathy; supported arm exercise
• SAEB  sinoatrial entrance block
• SAECG, SaECG  signal averaged electrocardiogram
• SAED  semiautomatic external defibrillator
• SAEFVSS  Serious Adverse Events Following Vaccination Surveillance Scheme [Australia]
• SAEM  Society for Academic Emergency Medicine
• SAEP  Salmonella abortus equi pyrogen
• SAF  scrapie-associated fibrils; self-articulating femoral; serum accelerator factor; simultaneous auditory feedback; standard analytic file [Medicare]
• SAFA  soluble antigen fluorescent antibody
• SAFE  Safety After Fifty Evaluation [study]; surgery, antibiotics, face-washing, environmental change [trachoma]
• SAFE-PACE  Syncope and Falls in the Elderly-Role of Pacemaker [study]
• SAFHS  sonic-accelerated fracture-healing system
• SAFIRE-D  Symptomatic Atrial Fibrillation Investigation and Randomized Evaluation of Dofetilide [study]
• SAFTEE-GI  systematic assessment for treatment emergent events-general inquiry
• SAFTEE-SI  systematic assessment for treatment emergent events-systematic inquiry
• SAFV  Saint-Floris virus
• SAG  salicyl acyl glucuronide; sodium antimony gluconate; sonoangiography; streptavidin-gold; superantigen; Swiss agammaglobulinemia
• sag  sagittal
• SAGE  Serial Analysis of Gene Expression [database]; Systematic Assessment of Geriatric Drug Use via Epidemiology [study]
• SAGES  signal-averaged electrocardiographic [ECG] study
• SAGM  sodium chloride, adenine, glucose, mannitol
• SAH  S-adenosyl-L-homocysteine; subarachnoid hemorrhage
• SAHA  seborrhea-hypertrichosis/hirsutism-alopecia [syndrome]
• SAHCS  Streptokinase-Aspirin-Heparin Collaborative Study
• SAHH  S-adenosylhomocysteine hydrolase
• SAHIGES  Staphylococcus aureus hyperimmunoglobulinemia E syndrome
• SA-HRP  streptavidin-conjugated horse radish peroxidase
• SAHS  San Antonio Heart Study; sleep apnea-hypersomnolence [syndrome]
• SAHV  St Abb's Head virus
• SAI  Self-Analysis Inventory; Sexual Arousability Inventory; Social Adequacy Index; suppressor of anchorage independence; systemic active immunotherapy
• SAIC  Science Applications International Corporation [database]
• SAICAR  sylaminoimidazole carboxylase
• SAID  specific adaptation to imposed demand [principle]
• SAIDS  sexually acquired immunodeficiency syndrome; simian acquired immune deficiency syndrome
• SAIMS  student applicant information management system
• SAKV  Sakhalin virus
• SAL  sensorineural activity level; sterility assurance level; suction-assisted lipectomy
• Sal  salicylate, salicylic; Salmonella
• sAl  serum aluminum [level]
• sal  salicylate, salicylic; saline; saliva
• SALAD  Surgery vs Angioplasty for Proximal Left Anterior Descending Coronary Artery Stenosis [trial]
• Salm  Salmonella
• SALP  salpingectomy; salpingography; serum alkaline phosphatase
• Salpx  salpingectomy
• SALT  skin-associated lymphoid tissue; Swedish Aspirin in Low Dose Trial
• SALTS  Strategic Alternatives with Ticlopidine in Stenting [study]
• SALV  Salehebad virus
• SAM  S-adenosyl-L-methionine; scanning acoustic microscope; self-assembled monolayer; senescence accelerated mouse; sex arousal mechanism; short-arc motion; staphylococcal absorption method; subject area model; substrate adhesion molecule; sulfated acid mucopolysaccharide; surface active material; system for assembling markers; systolic anterior motion
• SAMA  schizoaffective mania mainly affective [type]; Student American Medical Association
• SAMD  S-adenosyl-L-methionine decarboxylase
• SAM-DC  S-adenosyl-L-methionine decarboxylase
• SAMe  S-adenosyl-L-methionine
• SAMHSA  Substance Abuse and Mental Health Services Administration
• SAMI  Streptokinase and Angioplasty in Myocardial Infarction [trial]; Streptokinase in Acute Myocardial Infarction [study]; Students for Advancement of Medical Instrumentation
• SAMII  Survey of Acute Myocardial Ischemia and Infarction [study]
• SAMIT  Streptokinase and Angioplasty Myocardial Infarction Trial
• SAMMEC  Smoking-Attributable Mortality, Morbidity, and Economic Costs [study]
• SAMO  Senior Administrative Medical Officer
• SAMPLE  Study on Ambulatory Monitoring of Pressure and Lisinopril Evaluation
• SAMS  Society for Advanced Medical Systems; substrate adhesion molecule
• S-AMY  serum amylase
• SAN  sinoatrial node; sinoauricular node; slept all night; solitary autonomous nodule; storage area network
• SANA  sinoatrial node artery
• Sanat  sanatorium
• SANDR  sinoatrial nodal reentry
• SANE  sexual assault nurse examiner
• sang  sanguineous
• SANGUIS  Safe and Good Use of Blood in Surgery [study]
• sanit  sanitary, sanitation
• SANS  scale for the assessment of negative symptoms
• SANV  Sango virus
• SANWS  sinoatrial node weakness syndrome
• SAO  small airway obstruction; splanchnic artery occlusion; subvalvular aortic obstruction
• S_AO2  oxygen saturation in alveolar gas
• SaO₂  oxygen saturation
• S_aO2  oxygen saturation in arterial blood
• SAP  sensory action potential; serum acid phosphatase; serum alkaline phosphatase; serum amyloid P; shrimp alkaline phosphatase; situs ambiguus with polysplenia; sphingolipid activator protein; stable angina pectoris; Staphylococcus aureus protease; subjective and physical [findings]; surfactant-associated protein; systemic arterial pressure; systolic arterial pressure
• SAPA  scan along polygonal approximation; spatial average pulse average
• SAPALDIA  Swiss Study of Air Pollution and Lung Diseases in Adults
• SAPAT  Swedish Angina Pectoris Aspirin Trial
• SAPD  short action potential duration; signal averaged P-wave duration; sphingolipid activator protein deficiency
• SAPF  simultaneous anterior and posterior [spinal] fusion
• saph  saphenous
• SAPHO  synovitis-acne-pustulosis hyperostosis-osteomyelitis [syndrome]
• SAPK  stress-activated protein kinase
• SA-PMP  streptavidin-paramagnetic particle
• SAPPHIRE  Stanford Asian Pacific Program in Hypertension and Insulin Resistance
• SAPS  simplified acute physiology score; Staphylococcus aureus protease sensitivity
• SAPV  Sapphire virus
• SAPX  salivary peroxidase
• SAQ  saquinavir; self-applied questionnaire; short arc quadriceps [muscle]
• SAQC  statistical analysis of quality control
• SAR  scaffold attachment region [genomic sequencing]; scatter/air ratio [radiation]; seasonal allergic rhinitis; sexual attitude reassessment; slowly adapting receptor; specific absorption rate; structure-activity relationship; supplied air respirator; supra-aortic ridge; supra-aortic ring; synthetic aperture radar
• SARA  sexually acquired reactive arthritis; Superfund Amendments and Reauthorization
• SARB  Statistical Application and Research Branch [FDA]
• SARI  serotonin-2 antagonist reuptake inhibitor
• SARS  San Antonio Rotablator study; severe acute respiratory syndrome
• SART  simultaneous algebraic reconstruction technique
• SARV  Santa Rosa virus
• SAS  sarcoma amplified sequence; Scandinavian Angiopeptin Study; sedation-agitation scale; Scottish Ambulance Service; self-rating anxiety scale; short arm splint; Sklar Aphasia Scale; severe aortic stenosis; sleep apnea syndrome; small animal surgery; small aorta syndrome; social adjustment scale; sodium amylosulfate; space-adaptation syndrome; specific activity scale; statistical analysis system; sterile aqueous solution; sterile aqueous suspension; subaortic stenosis; subarachnoid space; sulfasalazine; supravalvular aortic stenosis; surface-active substance; synchronous atrial stimulation
• SASA  solvent-accessible surface area
• SASD  State Ambulatory Surgery Databases
• SASMAS  skin-adipose superficial musculoaponeurotic system
• SASP  salicylazosulfapyridine
• SASPP  syndrome of absence of septum pellucidum with preencephaly
• SASS  Syngen Acute Stroke Study
• SAS-SR  social adjustment scale, self-report
• SASSY  Seniors Active Spirits Staying Young [program]
• SAST  selective arterial secretin injection test; Self-administered Alcoholism Screening Test; serum aspartate aminotransferase
• SAT  saliva alcohol test; Saruplase Alteplase Study; satellite; satisfactibility; saturated, saturation; serum antitrypsin; shifting attention; single-agent chemotherapy; slide agglutination test; sodium ammonium thiosulfate; spermatogenic activity test; spontaneous activity test; subacute thrombosis; subacute thyroiditis; subcutaneous adipose tissue; sulfate adenyltransferase; symptomless autoimmune thyroiditis; systematic assertive therapy; systematic axis transform; systolic acceleration time
• Sat, sat  saturation, saturated
• SATA  spatial average, temporal average
• SATB  special aptitude test battery
• satd  saturated
• SATE  Safety Antiarrhythmic Trial Evaluation
• SATL  surgical Achilles tendon lengthening
• SATP  spatial average temporal peak
• SATS  substance, amount ingested, time ingested, symptoms
• SATSA  Swedish Adoption-Twin Study of Aging
• SATT  Scottish Adjuvant Tamoxifen Trial
• SATV  Sathuperi virus
• SAU  statistical analysis unit
• SAUDIS  Sudden and Unexpected Death in Sports [study]
• SAV  San Angelo virus; sequential atrioventricular [pacing]; Sikhote-Alyn virus
• SAVD  spontaneous assisted vaginal delivery
• SAVE  saved-young-life equivalent; sudden A-ventilatory event; Survival and Ventricular Enlargement [trial]
• SAVED  saphenous vein de novo
• SAW  surface acoustic wave
• SAX  short axis; surface antigen, X-linked
• SAx  short axis
• SAX-APEX  short-axis plane, apical
• SAX-MV  short-axis, mitral valve
• SAX-PM  short-axis plane, papillary muscle
• SB  Bachelor of Science [L. Scientiae Baccalaureus]; Schwartz-Bartter [syndrome]; serum bilirubin; shortness of breath; sick bay; sideroblast; single blind [study]; single breath; sinus bradycardia; small bowel; sodium balance; sodium bisulfite; Southern blotting; soybean; spike burst; spina bifida; spontaneous blastogenesis; spontaneous breathing; standard [hospital] bed; Stanford-Binet [Intelligence Scale]; stereotyped behavior; sternal border; stillbirth; Sudan black [stain]; surface binding
• S-B  Sengstaken-Blakemore [tube]; suppression burst
• Sb  strabismus
• sb  stilb
• SBA  serum bactericidal activity; serum bile acid; soybean agglutinin; spina bifida aperta
• SBAHC  school-based adolescent health care
• SBB  stimulation-bound behavior
• SBBT  specialist in blood bank technology
• SBC  school-based clinic; Schwarz's bayesian criterion; serum bactericidal concentration; strict bed confinement

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