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| Abbrev. | Meaning |
|---|---|
| s | without (s with a bar over it) (from Middle English sans, borrowed from Old French sans, Latin sine) |
| S | sacrum |
| Sx | symptoms |
| S1 | first heart sound |
| S2 | second heart sound |
| SA | sinoatrial node |
| SAB | staphylococcal bacteremia spontaneous abortion (that is, miscarriage) |
| SAH | subarachnoid hemorrhage |
| SAN | sinoatrial node |
| SAPS II | simplified acute physiology score |
| SAPS III | simplified acute physiology score |
| SARS | severe acute respiratory syndrome |
| SB | small bowel (see small intestine) |
| SBE | subacute bacterial endocarditis |
| SBO | small bowel obstruction |
| SBP | systolic blood pressure spontaneous bacterial peritonitis |
| s.c. | subcutaneous (from Latin subcutis) |
| SCC | squamous cell carcinoma |
| SCD | sudden cardiac death |
| SCLC | small cell lung cancer |
| SCID | severe combined immunodeficiency |
| scope | microscope or endoscope |
| s.d. | subdermal |
| SD σ |
standard deviation |
| SDH | subdural hematoma |
| Sed | sedimentation (rate) (see erythrocyte sedimentation rate) |
| Segs | segmented cells |
| SEM | systolic ejection murmur (see heart murmur) |
| SERT | serotonin transporter |
| SFA | superficial femoral artery serum folic acid |
| SGA | small for gestational age |
| SG cath | Swan-Ganz catheter (see pulmonary artery catheter) |
| SGOT | serum glutamic oxaloacetic transaminase |
| SGPT | serum glutamic pyruvic transaminase |
| SH SHx |
social history (personal habits, living situation, job) |
| SHBG | sex hormone-binding globulin |
| SHx | surgical history |
| SI | International System of Units suicidal ideation seriously ill sacroiliac (joint) |
| SIADH | syndrome of inappropriate antidiuretic hormone |
| SICU | surgical intensive care unit |
| SIDS | sudden infant death syndrome |
| SIMV | synchronized intermittent mechanical ventilation |
| si op. sit | if needed (from Latin si opus sit) |
| SIT | stress inoculation training (see posttraumatic stress disorder) |
| SK | streptokinase |
| sl | sublingual |
| SLE | systemic lupus erythematosus |
| SLEV | St. Louis virus |
| SLR | straight leg raise (see Lasègue's sign) |
| SLL | small lymphocytic lymphoma |
| SM | multiple sclerosis (from Latin sclerosis multiplex) |
| SMA | sequential multiple analysis superior mesenteric artery |
| SMA-6 | six-channel serum multiple analysis |
| SMA-7 | serum metabolic assay |
| SMS | senior medical student |
| SMT | spinal manipulative therapy |
| SMV | superior mesenteric vein |
| SN | student nurse |
| SNB | sentinel node biopsy (ductal carcinoma) |
| SNP | sodium nitroprusside; single nucleotide polymorphism |
| SNRI | serotonin-norepinephrine reuptake inhibitor |
| SNV | sin nombre virus (the most common type of hantavirus) |
| SOAP | subjective, objective, assessment, plan (how physicians’ notes may be organized) |
| SOB | shortness of breath (see dyspnea) |
| SOBOE | short of breath on exercise |
| SOL | space occupying lesion |
| Sol | solution |
| SOOB | send out of bed |
| SOS | if needed (from Latin si opus sit) |
| SP s/p |
status post |
| Spec | specimen |
| SPECT | single photon emission computed tomography |
| SPEP | serum protein electrophoresis |
| SPET | single photon emission tomography |
| Sp. fl. | spinal fluid (see cerebrospinal fluid) |
| Sp. gr. | specific gravity |
| SQ sq |
subcutaneous |
| SR | slow release (see also Time Release Technology (medicine)) |
| SROM | spontaneous rupture of membranes |
| SRS | stereotactic radiotherapy |
| SS | Hemoglobin SS (HbSS) (see in sickle-cell disease = SS disease) |
| SSPE | subacute sclerosing panencephalitis |
| ssRNA | single-stranded RNA |
| SSRI | selective serotonin reuptake inhibitor |
| SSSS | staphylococcal scalded skin syndrome |
| SSS | sick sinus syndrome |
| ST | heat stable |
| 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 |
| STNR | symmetrical tonic neck reflex |
| STOP | Surgical termination of pregnancy (sometimes suction termination of pregnancy) |
| Strep. Strepto. |
Streptococcus |
| STS | serological test for syphilis |
| Subq | subcutaneous |
| Supp | suppository |
| SUV | standardized uptake value—when used in positron emission tomography (PET) cancer scans—any lesion seen on a scan with a SUV of more than 3 indicates metabolic activity |
| SV | seminal vesicle stroke volume |
| SVC | superior vena cava |
| SVD | spontaneous vaginal delivery simple vertex delivery |
| SVI | systemic viral infection |
| SVN | small volume nebulizer |
| SVR | systemic vascular resistance |
| SVT | supraventricular tachycardia |
| Sx | surgery symptoms |
| SXA | single energy X-ray absorptiometer |
| SXR | skull x-ray |
| Sz | seizure |
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