| Abbreviations | Meaning |
 | QMWS | Quasi-morphine Withdrawal Syndrome |
| R-W | Rideal-Walker [coefficient]; Romano-Ward [syndrome] |
| RADS | Reactive Airways Dysfunction Syndrome; Retrospective Assessment Of Drug Safety |
| RALPH | Renal-anal-lung-polydactylyhamartoblastoma [syndrome] |
| RASS | Rheumatoid Arthritis And Sjögren Syndrome |
| RBAS | Rostral Basilar Artery Syndrome |
| RBS | Random Blood Sugar; Receptor Binding Site; Remote [computer] Backup Service; Roberts Syndrome; Rutherford Backscattering |
| RD | Riley-Day [syndrome] |
| RD | Rolland-Desbuquois [syndrome] |
| RDS | Respiratory Distress Syndrome |
| RDS | Raskin Depression Scale; Respiratory Distress Syndrome; Reticuloendothelial Depressing Substance; Rhodanese; Slow Retinal Degeneration |
| REAR | Renal, Ear, Anal, And Radial [malformation Syndrome] |
| REAS | Reasonably Expected As Safe; Retained, Excluded Antrum Syndrome |
| REEDS | Retention Of Tears, Ectrodactyly, Ectodermal Dysplasia, And Strange Hair, Skin And Teeth [syndrome] |
| RGS | Regulation Of Ga Signaling; Rieger Syndrome |
| RHE | Retinohepatoendocrinologic [syndrome] |
| RHS | Ramsay Hunt Syndrome |
| RHS | Rapp-Hodgkin Syndrome |
| RHS | Reciprocal Hindlimb-scratching [syndrome] |
| RHS | Richner-Hanhart Syndrome |
| RKH | Rokitansky-Küster-Hauser [syndrome] |
| RL | Renal Dysplasia-limb Defects [syndrome] |
| RLS | Recursive Least Square; Restless Leg Syndrome; Ringer Lactate Solution; Roussy-Levy Syndrome; Run-length Statistics |
| RMLS | Right Middle Lobe Syndrome |
| RMS | Red Man Syndrome |
| RMS | Repetitive Motion Syndrome |
| RMS | Rigid Man Syndrome |
| RMSS | Ruvalcaba-Myhre-Smith Syndrome |
| ROW | Rendu-Osler-Weber [syndrome]; Rest Of The World |
| ROXIS | Roxithromycin In Ischemic Syndromes [study] |
| RRIS | Recurrent Respiratory Infection Syndrome |
| RRS | Result Reporting [clinical Data] Repository System; Retrorectal Space; Richards-Rundle Syndrome |
| RS | Richter's Syndrome (transformation Of CLL In DLCL) |
| RS | Roberts Syndrome |
| RS | Raynaud Syndrome |
| RS | Reiter Syndrome |
| RS | Rett Syndrome |
| RS | Reye Syndrome |
| RSDS | Reflex Sympathetic Dystrophy Syndrome |
| RSS | Repetitive Stress Syndrome |
| RSS | Russell-Silver Syndrome |
| RSTS | Retropharyngeal Soft Tissue Space; Rubinstein-Taybi Syndrome |
| RT | Rubinstein-Taybi (syndrome) |
| RTS | Rett Syndrome |
| RTS | Rothmund-Thomson Syndrome |
| RTS | Rubinstein-Taybi Syndrome |
| RW | Radiological Warfare; Ragweed; Respiratory Work; Romano-Ward [syndrome]; Round Window |
| SADS | Sudden Arrhythmic Death Syndrome |
| SAHA | Seborrhea-hypertrichosis/hirsutism-alopecia [syndrome] |
| SAHIGES | Staphylococcus Aureus Hyperimmunoglobulinemia E Syndrome |
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