Washington Manual of Medical Therapeutics
- Sacral nerve stimulation
- Sacroiliitis
- Salicylates
- Salivary cortisol
- Salmeterol [table]
- Sarcoma
- Sausage digit
- Saxagliptin [table]
- SC allergen immunotherapy (SCIT)
- Scleroderma
- Sclerosing encapsulating peritonitis
- Sclerotherapy, gastrointestinal bleeding
- Secondary adrenal failure
- Secondary eosinophilia
- Secondary headaches
- Secondary hemostasis
- Secondary hyperaldosteronism
- Secondary hyperparathyroidism
- Secondary hypothyroidism
- Secondary immune thrombocytopenia
- Secondary immunodeficiencies
- Secondary peritonitis
- Secondary pneumothorax
- Secondary prophylaxis
- Secondary Raynaud phenomenon (RP)
- Secondary spontaneous pneumothorax
- Secondary syphilis
- Secretory adenomas
- Sedative hypnotic
- Segmental colitis associated with diverticulosis (SCAD)
- Selective IgA deficiency
- Selenium [table]
- Selexipag [table]
- Self-monitoring of blood glucose (SMBG)
- Semielemental oligomeric formulas
- Seminoma
- Sensor augmented pump (SAP) therapy
- Septal defect closure
- Septic arthritis
- Septicemic plague
- Septic shock
- Serotonin 5-hydroxytryptamine-3 (5-HT₃) receptor antagonists
- Serotonin release assay (SRA)
- Serum alkaline phosphatase, Paget disease
- Serum and bronchoalveolar lavage (BAL) galactomannan assay
- Serum calcium
- Serum methylmalonic acid (MMA)
- Serum phosphorus
- Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
- Severe asymptomatic hypertension
- Severe hyponatremia
- Severe symptomatic hypomagnesemia
- Sexual orientation
- Shiga toxigenic Ecoli hemolytic-uremic syndrome (STEC-HUS)
- Short-acting bronchodilators
- Shwachman-Diamond syndrome
- Sickle cell disease (SCD)
- Sickle cell trait
- Sideroblastic anemias
- Sigmoidoscopy, diarrhea
- Silicosis
- Simple facemask
- Simultaneous liver kidney (SLK) transplant
- Single- and double-balloon enteroscopy
- Single-photon emission computed tomography (SPECT)
- Sinoatrial (SA) node
- Sinoatrial nodal reentrant tachycardia (SANRT)
- Sinus arrest
- Sinus bradycardia
- Sinus exit block
- Sinus rhythm
- Sinus tachycardia (ST)
- Sitagliptin [table]
- Skin and soft tissue infections (SSTIs)
- Skin cancers, graft rejection
- Skin testing
- Small-cell lung cancer
- Small-vessel disease
- Small vessel vasculitis
- Smooth muscle relaxants
- Society of Thoracic Surgeons (STS)
- Sodium-glucose cotransporter-2 (SGLT2) [table]
- Sodium imbalances (disorders)
- Sodium phosphate
- Soft tissue infection
- Solid malignancies
- Soluble guanylate cyclase stimulator
- Sorafenib
- Specific antibody deficiency
- Speech therapy, transgender individuals
- Spinal cord concussion
- Spinal cord syndromes
- Spirometry
- Spondyloarthritides (SpAs)
- Spontaneous/unprovoked venous thromboembolism
- Sporothrix schenckii
- Sporotrichosis
- Stage 1 hypertension
- Stage 2 hypertension
- Standard precautions
- Staphylococcus lugdunensis
- Steatorrhea
- Stem cell transplantation
- Stenotrophomonas maltophilia
- Stent thrombosis
- Sterile pyuria
- Steroid-sparing agent, giant cell arteritis (GCA)
- Stevens-Johnson syndrome (SJS)
- Stimulant laxatives
- Stool examination, eosinophilia
- Streptococcus anginosus
- Streptococcus gallolyticus
- Streptococcus pneumoniae meningitis
- Streptogramin
- Stress-induced peptic ulcer disease
- Strictures
- Struvite stones
- Subacute bacterial endocarditis (SBE)
- Subacute cutaneous lupus erythematosus
- Subarachnoid hemorrhage (SAH)
- Subclass deficiency
- Subclinical hyperthyroidism
- Subclinical hypothyroidism
- Subcutaneous (SC) injectable therapies [table]
- Subcutaneous (SC) insulin
- Submassive pulmonary embolism
- Succinylcholine [table]
- Sucralfate, peptic ulcer disease (PUD)
- Sudden cardiac arrest (SCA)
- Sudden cardiac death (SCD)
- Sudden-onset focal neurologic deficit
- Sulfonamide allergy
- Sulfonamides
- Sulfonylureas (SFU) [table]
- Superficial frostbite
- Superficial swab cultures
- Superficial thrombophlebitis
- Superficial venous thrombophlebitis
- Superior vena cava (SVC) syndrome [table]
- Supersaturated potassium iodide (SSKI)
- Supplemental oxygen
- Surgical biopsy
- Sustained monomorphic ventricular tachycardia (SMVT)
- Sympathetic ganglion blockade, Raynaud phenomenon
- Sympathomimetic toxidrome
- Symptomatic cholelithiasis
- Symptomatic hypermagnesemia
- Symptom control, inflammatory bowel disease
- Synchronized intermittent mandatory ventilation (SIMV)
- Syndrome of inappropriate ADH secretion (SIADH)
- Systemic emboli
- Systemic inflammatory response syndrome (SIRS)
- Systemic lupus erythematosus (SLE)
- Systemic sclerosis
- Systolic anterior motion (SAM)