| Abbreviations | Meaning |
 | SOPA | Survey Of Pain Attitudes; Syndrome Of Primary Aldosteronism |
| PTS | Postthrombotic Syndrome |
| ABS | Amniotic Band Syndrome |
| STS | Staphylococcal Toxic Syndrome |
| NNS | Neural Network Sramek [equation]; Nicotine Nasal Spray; Nonneoplastic Syndrome |
| LS | Leigh Syndrome |
| AAS | Aarskog-Scott [syndrome]; Acid Aspiration Syndrome; Alcoholic Abstinence Syndrome; American Academy Of Sanitarians |
| MERRLA | Myoclonus Epilepsy-ragged Red Fibers-lactic Acidosis [syndrome] |
| LARD | Lacrimoauriculoradiodental [syndrome] |
| CUS | Carotid Ultrasound Examination; Catheterized Urine Specimen; Contact Urticaria Syndrome |
| KHS | King's Honorary Surgeon; Kinky Hair Syndrome; Krebs-Henseleit Solution |
| SMDS | Secondary Myelodysplastic Syndrome; Switched Multimegabit Data Service |
| LOS | Low Cardiac Output Syndrome |
| PMIS | Postmyocardial Infarction Syndrome; PSRO Management Information System |
| TINU | Tubulo-interstitial Nephritis-uveitis [syndrome] |
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