Internal Medicine Acronyms

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Internal Medicine Alphabet – S

S. No	Acronyms	Full Form	Short Explanation	Practical Example
S001	SA	Sinoatrial	Heart’s natural pacemaker	SA node initiates heartbeat
S002	SAB	Subarachnoid Bleed	Bleeding in brain space	SAB diagnosed on CT scan
S003	SAD	Seasonal Affective Disorder	Depression in specific seasons	SAD treated with light therapy
S004	SAE	Serious Adverse Event	Critical medical incident	SAE reported in clinical trials
S005	SABA	Short-Acting Beta Agonist	Quick-relief asthma inhaler	SABA used for acute asthma attack
S006	SACE	Serum Angiotensin-Converting Enzyme	Lab marker	SACE elevated in sarcoidosis
S007	SAH	Subarachnoid Hemorrhage	Bleeding around brain	SAH presents with sudden headache
S008	SALT	Speech And Language Therapy	Rehabilitation therapy	SALT used post-stroke
S009	SAM	Systolic Anterior Motion	Heart valve movement	SAM seen in hypertrophic cardiomyopathy
S010	SARS	Severe Acute Respiratory Syndrome	Viral respiratory infection	SARS outbreak monitored globally
S011	SAT	Subacute Thyroiditis	Thyroid inflammation	SAT causes painful thyroid enlargement
S012	SBP	Systolic Blood Pressure	Upper number of BP	SBP measured during vital signs
S013	SBRT	Stereotactic Body Radiotherapy	Targeted cancer treatment	SBRT used for lung tumors
S014	SC	Subcutaneous	Injection under the skin	Insulin given SC
S015	SCC	Squamous Cell Carcinoma	Skin or tissue cancer	SCC biopsy confirms diagnosis
S016	SCD	Sickle Cell Disease	Genetic blood disorder	SCD causes anemia and pain crises
S017	SCI	Spinal Cord Injury	Injury to spinal cord	SCI assessed via neurological exam
S018	SCLC	Small Cell Lung Cancer	Aggressive lung cancer type	SCLC treated with chemo/radiation
S019	SCN	Sodium Channel Neuron	Ion channel in nerves	SCN mutations cause epilepsy
S020	SCr	Serum Creatinine	Kidney function marker	SCr elevated in AKI
S021	SD	Standard Deviation	Statistical measure	SD used in lab result analysis
S022	SDH	Subdural Hematoma	Brain bleed under dura	SDH seen after head trauma
S023	SE	Status Epilepticus	Prolonged seizure	SE managed in ICU
S024	SED	Systemic Erythematous Disease	Autoimmune disorder	SED includes SLE and vasculitis
S025	SFA	Superficial Femoral Artery	Leg artery	SFA stenosis assessed in Doppler
S026	SGOT	Serum Glutamic-Oxaloacetic Transaminase	Liver enzyme	SGOT elevated in hepatitis
S027	SGPT	Serum Glutamic-Pyruvic Transaminase	Liver enzyme	SGPT elevated in liver injury
S028	SIADH	Syndrome of Inappropriate Antidiuretic Hormone	Water balance disorder	SIADH causes hyponatremia
S029	SIRS	Systemic Inflammatory Response Syndrome	Inflammatory state	SIRS criteria used in sepsis
S030	SLE	Systemic Lupus Erythematosus	Autoimmune disease	SLE treated with immunosuppressants
S031	SLN	Sentinel Lymph Node	First lymph node in drainage	SLN biopsy in breast cancer staging
S032	SMI	Silent Myocardial Infarction	Heart attack without symptoms	SMI detected on ECG
S033	SOB	Shortness of Breath	Difficulty breathing	SOB assessed in cardiac and pulmonary patients
S034	SOFA	Sequential Organ Failure Assessment	ICU scoring system	SOFA score predicts mortality
S035	SPAP	Systolic Pulmonary Artery Pressure	Heart/lung pressure	SPAP measured in echocardiography
S036	SpO2	Peripheral Oxygen Saturation	Blood oxygen level	SpO2 monitored via pulse oximeter
S037	SPINA	Structure-Parameter of Iodine Nutrition Analysis	Thyroid assessment	SPINA measured for hypothyroidism evaluation
S038	SPT	Skin Prick Test	Allergy diagnostic	SPT identifies allergen sensitivity
S039	SRA	Serotonin Release Assay	Lab test for platelet function	SRA positive in HIT
S040	SRBC	Sheep Red Blood Cell	Immunology lab reagent	SRBC used in hemagglutination tests
S041	SROM	Spontaneous Rupture of Membranes	Labor complication	SROM noted in obstetrics
S042	SRU	Serum Retinol Unit	Vitamin A measurement	SRU assessed in malnutrition
S043	SSI	Surgical Site Infection	Postoperative infection	SSI treated with antibiotics
S044	SSRI	Selective Serotonin Reuptake Inhibitor	Antidepressant class	SSRI prescribed for depression
S045	ST	Segment	ECG segment	ST elevation indicates MI
S046	ST elevation	ST-segment Elevation	Heart attack marker on ECG	ST elevation in anterior MI
S047	STEMI	ST-Elevation Myocardial Infarction	Heart attack type	STEMI managed with PCI
S048	STS	Society of Thoracic Surgeons	Professional association	STS publishes cardiac surgery outcomes
S049	SUA	Serum Uric Acid	Gout marker	SUA elevated in hyperuricemia
S050	SVC	Superior Vena Cava	Major vein returning blood to heart	SVC syndrome causes facial swelling
S051	SVR	Systemic Vascular Resistance	Blood vessel resistance	SVR measured in hypertension
S052	SVT	Supraventricular Tachycardia	Fast heart rhythm	SVT treated with adenosine
S053	SWI	Susceptibility Weighted Imaging	MRI technique	SWI detects microbleeds
S054	SWL	Shock Wave Lithotripsy	Kidney stone treatment	SWL used to fragment renal calculi
S055	SX	Symptoms	Clinical manifestations	SX recorded during patient history
S056	Sx	Surgery	Surgical intervention	Sx performed for appendicitis
S057	SAA	Serum Amyloid A	Inflammatory marker	SAA elevated in infection
S058	SABG	Saphenous Artery Bypass Graft	Cardiac surgery procedure	SABG performed for coronary artery disease
S059	SCFE	Slipped Capital Femoral Epiphysis	Pediatric hip disorder	SCFE diagnosed in adolescent with hip pain
S060	SDH	Subdural Hematoma	Blood under dura mater	SDH seen in trauma CT scan
S061	SEGA	Subependymal Giant Cell Astrocytoma	Brain tumor	SEGA associated with tuberous sclerosis
S062	SFA	Superficial Femoral Artery	Leg artery	SFA stenosis detected on Doppler
S063	SG	Specific Gravity	Urine concentration measure	SG measured in urinalysis
S064	SGPT	Serum Glutamic-Pyruvic Transaminase	Liver enzyme	SGPT elevated in hepatitis
S065	SGOT	Serum Glutamic-Oxaloacetic Transaminase	Liver enzyme	SGOT elevated in liver injury
S066	SH	Sweet’s Hemolysis	Rare hemolytic disorder	SH diagnosed in lab tests
S067	SHF	Systolic Heart Failure	Heart failure with reduced EF	SHF treated with ACE inhibitors
S068	SI	Suicidal Ideation	Thoughts of self-harm	SI assessed in psychiatric evaluation
S069	SIBO	Small Intestinal Bacterial Overgrowth	Digestive disorder	SIBO tested with breath test
S070	SICU	Surgical Intensive Care Unit	ICU for post-op patients	SICU monitors post-surgery patients
S071	SID	Sudden Infant Death	Unexpected death in infants	SID prevention includes safe sleep practices
S072	SIHD	Stable Ischemic Heart Disease	Chronic coronary artery disease	SIHD managed with medications and lifestyle
S073	SIRS	Systemic Inflammatory Response Syndrome	Body-wide inflammation	SIRS criteria used in sepsis diagnosis
S074	SLE	Systemic Lupus Erythematosus	Autoimmune disease	SLE managed with immunosuppressants
S075	SLN	Sentinel Lymph Node	First node in lymphatic drainage	SLN biopsy in breast cancer
S076	SMI	Silent Myocardial Infarction	Heart attack without symptoms	SMI detected on ECG
S077	SOB	Shortness of Breath	Difficulty breathing	SOB monitored in COPD
S078	SOFA	Sequential Organ Failure Assessment	ICU scoring system	SOFA score predicts patient mortality
S079	SPAP	Systolic Pulmonary Artery Pressure	Heart/lung pressure	SPAP measured via echocardiography
S080	SpO2	Peripheral Oxygen Saturation	Blood oxygen	SpO2 monitored with pulse oximeter

S. No	Acronyms	Full Form	Short Explanation	Practical Example
S081	SPINA	Structure-Parameter of Iodine Nutrition Analysis	Thyroid assessment parameter	SPINA measured for hypothyroidism evaluation
S082	SPT	Skin Prick Test	Allergy diagnostic test	SPT identifies allergen sensitivity
S083	SRA	Serotonin Release Assay	Lab test for platelet function	SRA positive in heparin-induced thrombocytopenia
S084	SRBC	Sheep Red Blood Cell	Lab reagent	SRBC used in hemagglutination tests
S085	SROM	Spontaneous Rupture of Membranes	Labor complication	SROM noted in obstetric care
S086	SRU	Serum Retinol Unit	Vitamin A measurement	SRU assessed in malnutrition evaluation
S087	SSI	Surgical Site Infection	Postoperative infection	SSI treated with antibiotics
S088	SSRI	Selective Serotonin Reuptake Inhibitor	Antidepressant class	SSRI prescribed for depression
S089	ST	Segment	ECG segment	ST segment elevation indicates MI
S090	ST elevation	ST-Segment Elevation	Marker of heart attack on ECG	ST elevation in anterior MI
S091	STEMI	ST-Elevation Myocardial Infarction	Type of heart attack	STEMI managed with PCI
S092	STS	Society of Thoracic Surgeons	Professional association	STS publishes cardiac surgery outcomes
S093	SUA	Serum Uric Acid	Marker for gout	SUA elevated in hyperuricemia
S094	SVC	Superior Vena Cava	Major vein returning blood to heart	SVC syndrome causes facial swelling
S095	SVR	Systemic Vascular Resistance	Resistance of blood vessels	SVR measured in hypertension
S096	SVT	Supraventricular Tachycardia	Fast heart rhythm	SVT treated with adenosine
S097	SWI	Susceptibility Weighted Imaging	MRI technique	SWI detects microbleeds in brain
S098	SWL	Shock Wave Lithotripsy	Kidney stone treatment	SWL used for renal calculi
S099	SX	Symptoms	Clinical manifestations	SX recorded during patient evaluation
S100	Sx	Surgery	Surgical intervention	Sx performed for appendectomy
S101	SAA	Serum Amyloid A	Inflammatory marker	SAA elevated in infection
S102	SABG	Saphenous Artery Bypass Graft	Cardiac surgery procedure	SABG performed for coronary artery disease
S103	SCFE	Slipped Capital Femoral Epiphysis	Pediatric hip disorder	SCFE diagnosed in adolescent with hip pain
S104	SDH	Subdural Hematoma	Blood under dura mater	SDH seen in trauma CT scan
S105	SEGA	Subependymal Giant Cell Astrocytoma	Brain tumor	SEGA associated with tuberous sclerosis
S106	SFA	Superficial Femoral Artery	Leg artery	SFA stenosis detected in Doppler
S107	SG	Specific Gravity	Urine concentration measure	SG measured in urinalysis
S108	SGPT	Serum Glutamic-Pyruvic Transaminase	Liver enzyme	SGPT elevated in hepatitis
S109	SGOT	Serum Glutamic-Oxaloacetic Transaminase	Liver enzyme	SGOT elevated in liver injury
S110	SH	Sweet’s Hemolysis	Rare hemolytic disorder	SH diagnosed in lab tests
S111	SHF	Systolic Heart Failure	Heart failure with reduced EF	SHF treated with ACE inhibitors
S112	SI	Suicidal Ideation	Thoughts of self-harm	SI assessed in psychiatric evaluation
S113	SIBO	Small Intestinal Bacterial Overgrowth	Digestive disorder	SIBO tested with breath test
S114	SICU	Surgical Intensive Care Unit	ICU for post-op patients	SICU monitors post-surgery patients
S115	SID	Sudden Infant Death	Unexpected death in infants	SID prevention includes safe sleep practices
S116	SIHD	Stable Ischemic Heart Disease	Chronic coronary artery disease	SIHD managed with medications and lifestyle
S117	SIRS	Systemic Inflammatory Response Syndrome	Body-wide inflammation	SIRS criteria used in sepsis diagnosis
S118	SLE	Systemic Lupus Erythematosus	Autoimmune disease	SLE managed with immunosuppressants
S119	SLN	Sentinel Lymph Node	First node in lymphatic drainage	SLN biopsy in breast cancer staging
S120	SMI	Silent Myocardial Infarction	Heart attack without symptoms	SMI detected on ECG
S121	SOB	Shortness of Breath	Difficulty breathing	SOB monitored in COPD or heart failure
S122	SOFA	Sequential Organ Failure Assessment	ICU scoring system	SOFA score predicts mortality risk
S123	SPAP	Systolic Pulmonary Artery Pressure	Heart/lung pressure	SPAP measured via echocardiography
S124	SpO2	Peripheral Oxygen Saturation	Blood oxygen level	SpO2 monitored via pulse oximeter
S125	SPECT	Single-Photon Emission Computed Tomography	Imaging technique	SPECT used in cardiac perfusion studies
S126	SPI	Serum Protein Index	Lab marker	SPI evaluated in nutritional assessment
S127	SPL	Splenomegaly	Enlarged spleen	SPL noted on physical exam or imaging
S128	SQ	Subcutaneous	Injection under the skin	Insulin administered SQ
S129	SR	Sustained Release	Medication formulation	SR tablets taken once daily
S130	SRA	Serotonin Release Assay	Platelet function test	SRA positive in heparin-induced thrombocytopenia
S131	SRB	Sulfate-Reducing Bacteria	Bacteria in microbiology	SRB detected in stool cultures
S132	SRS	Stereotactic Radiosurgery	Precise radiotherapy	SRS used for brain tumors
S133	SSR	Sympathetic Skin Response	Neurological test	SSR measured in autonomic testing
S134	SSU	Small Subunit	Ribosomal RNA component	SSU analyzed in molecular biology
S135	ST	Sinus Tachycardia	Fast heart rhythm from sinus node	ST noted on ECG
S136	STS	Saphenous-Truncus Shunt	Vascular surgery procedure	STS created in bypass surgery
S137	ST elevation	ST-segment Elevation	ECG marker of MI	ST elevation in acute MI
S138	STEMI	ST-Elevation Myocardial Infarction	Heart attack type	STEMI managed with PCI
S139	STI	Sexually Transmitted Infection	Infection via sexual contact	STI screening performed routinely
S140	STK	Stroke	Cerebrovascular event	STK treated with thrombolysis
S141	STN	Subthalamic Nucleus	Brain structure	STN targeted in deep brain stimulation
S142	STP	Standard Temperature and Pressure	Lab measurement	STP used in gas studies
S143	STS	Society of Thoracic Surgeons	Professional association	STS publishes cardiac surgery outcomes
S144	SUA	Serum Uric Acid	Marker for gout	SUA elevated in hyperuricemia
S145	SVC	Superior Vena Cava	Major vein returning blood to heart	SVC syndrome causes facial swelling
S146	SVR	Systemic Vascular Resistance	Resistance in blood vessels	SVR measured in ICU
S147	SVT	Supraventricular Tachycardia	Fast heart rhythm	SVT treated with adenosine
S148	SWI	Susceptibility Weighted Imaging	MRI technique	SWI detects brain microbleeds
S149	SWL	Shock Wave Lithotripsy	Kidney stone treatment	SWL used for renal calculi
S150	SX	Symptoms	Clinical manifestations	SX recorded during patient history
S151	Sx	Surgery	Surgical intervention	Sx performed for appendicitis
S152	SAA	Serum Amyloid A	Inflammatory marker	SAA elevated in acute infection
S153	SABG	Saphenous Artery Bypass Graft	Cardiac surgery procedure	SABG performed in CAD
S154	SCFE	Slipped Capital Femoral Epiphysis	Pediatric hip disorder	SCFE diagnosed in adolescent
S155	SDH	Subdural Hematoma	Blood under dura	SDH detected on CT scan
S156	SEGA	Subependymal Giant Cell Astrocytoma	Brain tumor	SEGA associated with tuberous sclerosis
S157	SFA	Superficial Femoral Artery	Leg artery	SFA stenosis detected via Doppler
S158	SG	Specific Gravity	Urine concentration	SG measured in urinalysis
S159	SGPT	Serum Glutamic-Pyruvic Transaminase	Liver enzyme	SGPT elevated in liver disease
S160	SGOT	Serum Glutamic-Oxaloacetic Transaminase	Liver enzyme	SGOT elevated in hepatitis
S161	SH	Sweet’s Hemolysis	Hemolytic disorder	SH diagnosed in lab tests
S162	SHF	Systolic Heart Failure	Heart failure with reduced EF	SHF treated with ACE inhibitors
S163	SI	Suicidal Ideation	Thoughts of self-harm	SI assessed in psychiatric evaluation
S164	SIBO	Small Intestinal Bacterial Overgrowth	Digestive disorder	SIBO tested via breath test
S165	SICU	Surgical Intensive Care Unit	Post-op ICU	SICU monitors surgical patients
S166	SID	Sudden Infant Death	Unexpected infant death	SID prevention with safe sleep
S167	SIHD	Stable Ischemic Heart Disease	Chronic CAD	SIHD managed medically
S168	SIRS	Systemic Inflammatory Response Syndrome	Inflammatory state	SIRS criteria used in sepsis
S169	SLE	Systemic Lupus Erythematosus	Autoimmune disorder	SLE treated with immunosuppressants
S170	SLN	Sentinel Lymph Node	First draining lymph node	SLN biopsy in breast cancer
S171	SMI	Silent Myocardial Infarction	Asymptomatic MI	SMI detected on ECG
S172	SOB	Shortness of Breath	Difficulty breathing	SOB noted in heart failure
S173	SOFA	Sequential Organ Failure Assessment	ICU scoring	SOFA score predicts mortality
S174	SPAP	Systolic Pulmonary Artery Pressure	Pulmonary pressure	SPAP measured via echo
S175	SpO2	Peripheral Oxygen Saturation	Oxygen level	SpO2 monitored via pulse oximeter
S176	SPECT	Single-Photon Emission Computed Tomography	Imaging	SPECT used for myocardial perfusion
S177	SPI	Serum Protein Index	Nutritional marker	SPI assessed in malnutrition
S178	SPL	Splenomegaly	Enlarged spleen	SPL noted on physical exam
S179	SQ	Subcutaneous	Injection under skin	Insulin administered SQ
S180	SR	Sustained Release	Medication type	SR tablet taken once daily
S181	SRA	Serotonin Release Assay	Platelet function test	SRA positive in HIT

S. No	Acronyms	Full Form	Short Explanation	Practical Example
S182	SRB	Sulfate-Reducing Bacteria	Bacteria involved in anaerobic metabolism	SRB detected in stool cultures
S183	SRS	Stereotactic Radiosurgery	Precise high-dose radiotherapy	SRS used for brain metastases
S184	SSR	Sympathetic Skin Response	Test of autonomic nervous system	SSR measured in neuropathy evaluation
S185	SSU	Small Subunit	Component of ribosomal RNA	SSU analyzed in molecular biology
S186	ST	Sinus Tachycardia	Fast heart rhythm originating from sinus node	ST noted on ECG
S187	STK	Stroke	Cerebrovascular event	STK treated with thrombolysis
S188	STI	Sexually Transmitted Infection	Infection transmitted sexually	STI screening performed in clinics
S189	STN	Subthalamic Nucleus	Brain structure involved in motor control	STN targeted in Parkinson’s disease DBS
S190	STP	Standard Temperature and Pressure	Reference conditions for lab measurements	STP used in gas studies
S191	STS	Society of Thoracic Surgeons	Professional association for thoracic surgery	STS publishes cardiac surgery outcomes
S192	SUA	Serum Uric Acid	Marker for gout or kidney function	SUA elevated in hyperuricemia
S193	SVC	Superior Vena Cava	Large vein returning blood to the heart	SVC syndrome presents with facial swelling
S194	SVR	Systemic Vascular Resistance	Resistance in systemic circulation	SVR calculated in hypertensive patients
S195	SVT	Supraventricular Tachycardia	Rapid heart rhythm from atria	SVT treated with adenosine or cardioversion
S196	SWI	Susceptibility Weighted Imaging	MRI technique to detect blood products	SWI identifies microbleeds in brain MRI
S197	SWL	Shock Wave Lithotripsy	Non-invasive kidney stone treatment	SWL used to fragment renal calculi
S198	SX	Symptoms	Clinical signs or complaints	SX recorded during patient evaluation
S199	Sx	Surgery	Operative intervention	Sx performed for appendicitis
S200	SAA	Serum Amyloid A	Acute phase reactant	SAA elevated in infections or inflammatory conditions