| Abbreviations | Meaning |
 | SCCB | Small-cell Carcinoma Of The Bronchus |
 | SCCL | Small Cell Carcinoma Of The Lung |
 | SCLC | Small Cell Lung Cancer |
 | SCLC | Small Cell Lung Carcinoma |
 | SCLD | Sickle-cell Chronic Lung Disease |
 | SCPR | Standard Cardiopulmonary Resuscitation |
 | SCV-CPR | Simultaneous Compression Ventilation-cardiopulmonary Resuscitation |
 | SLT | Single Lung Transplantation |
 | SPA | Sheep Pulmonary Adenomatosis |
 | SPAP | Systolic Pulmonary Artery Pressure |
 | SPC | Systemic To Pulmonary Collaterals |
 | SPCA | Systemic Pulmonary Collateral Artery |
 | SPE | Septic Pulmonary Edema |
 | SPF | Systemic Pulmonary Fistula |
 | SPH | Secondary Pulmonary Hemosiderosis; Severely And Profoundly Handicapped; Spherocyte; Spherocytosis; Sphingomyelin |
 | SPICU | Surgical Pulmonary Intensive Care Unit |
 | SPN | Senior Plan Network; Sialophorin; Solitary Pulmonary Nodule; Supplemental Parenteral Nutrition; Sympathetic Preganglionic Neuron |
 | TAF | Tracheobronchial Aspiration Fluid |
 | TAPVC | Total Anomalous Pulmonary Venous Connection |
 | TAPVD | Total Anomalous Pulmonary Venous Drainage |
 | TAPVR | Total Anomalous Pulmonary Venous Return |
 | TB | Terminal Bronchiole |
 | TB | Terminal Bronchus |
 | TB | Tracheobronchial |
 | TB | Tracheal Bronchiolar [region] |
 | TB | Tracheobronchitis |
 | TBAN | Transbronchial Aspiration Needle |
 | TBB | Transbronchial Biopsy |
 | TBBX | Transbronchial Biopsy |
 | TBFB | Tracheobronchial Foreign Body |
 | TBG | Beta-thromboglobulin; Testosterone-binding Globulin; Thyroglobulin; Thyroid-binding Globulin; Thyroxine-binding Globulin; Tracheobronchography; Tris-buffered Gey Solution |
 | TBI | Transbronchial Injection |
 | TBLB | Transbronchial Lung Biopsy |
 | TBM | Thrombomodulin; Total Body Mass; Tracheobronchiomegaly; Trophoblastic Basement Membrane; Tuberculous Meningitis; Tubular Basement Membrane |
 | TBNA | Total Body Neutron Activation; Transbronchial Needle Aspiration; Treated But Not Admitted |
 | TBS | Tracheobronchial Submucosa |
 | TBS | Tracheobronchoscopy |
 | TBT | Tolbutamide Test; Tracheobronchial Toilet; Tracheobronchial Tree; Transcervical Balloon Tuboplasty; Tributyltin |
 | TCB | Total Cardiopulmonary Bypass Transcatheter Biopsy |
 | TCL | Total Capacity Of The Lung |
 | TCP | Total Cardiopulmonary [connection] |
 | TCPS | Total Cavopulmonary Shunt |
 | TIPE | Thrombolysis In Pulmonary Embolism [study]; Thrombolysis In Peripheral Embolism [study] |
 | TL | Total Lung [capacity] |
 | TLC | Total Lung Capacity |
 | TLC | Total Lung Compliance |
 | TLCO | Transfer Factor For Lung Carbon Monoxide |
 | TLV | Threshold Limit Value; Tidal Liquid Ventilation; T-lymphotropic Virus; Total Lung Volume |
 | TLW | Total Lung Water |
 | TPA | Thrombotic Pulmonary Artery |