| Abbreviations | Meaning |
 | BRR | Bannayan-Riley-Ruvalcaba [syndrome]; Baroreceptor Reflex Response; Breathing Reserve Ratio |
| JBS | Johanson-Blizzard Syndrome |
| GUSTO-IIB | Global Use Of Strategies To Open Occluded Arteries In Acute Coronary Syndromes [trial] |
| IHS | Idiopathic Hypereosinophilic Syndrome |
| PMS | Perimenstrual Syndrome |
| POTS | Plain Old Telephone Service; Postural Orthostatic Tachycardia Syndrome |
| ZES | Zollinger-Ellison Syndrome; Zutphen Elderly Study |
| ABS | Amniotic Band Syndrome |
| HHH | Hyperornithinemia, Hyperammonemia, Homocitrillinuria [syndrome] |
| FVS | Fetal Valproate Syndrome; Fig Virus S |
| NKHS | Nonketotic Hyperosmolar Syndrome; Normal Krebs-Henseleit Solution |
| SRUS | Solitary Rectal Ulcer Syndrome |
| PHS | Pseudoprogeria-Hallermann-Streiff [syndrome] |
| SSS | Sick Sinus Syndrome |
| ITFS | Iliotibial Tract Friction Syndrome; Incomplete Testicular Feminization Syndrome |
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