| Abbreviations | Meaning |
 | OPDS | Otopalatodigital Syndrome |
| OPS | Operations; Optical Position Sensor; Osteoporosis-pseudolipoma Syndrome; Outpatient Service; Outpatient Surgery |
| OPS | Operations; Optical Position Sensor; Optimal Parameter Search [algorithm]; Osteoporosis-pseudolipoma Syndrome; Outpatient Service; Outpatient Surgery |
| OPUS | Orbofiban In Patients With Unstable Coronary Syndromes [study] |
| ORC | Oculo-reno-cerebellar [syndrome] |
| ORC | Oculo-reno-cerebellar [syndrome]; Origin Recognition Complex |
| ORS | Olfactory Reference Syndrome |
| ORW | Osler-Rendu-Weber (syndrome) |
| ORW | Osler-Rendu-Weber [syndrome] |
| OS | Omenn Syndrome |
| OS | Opitz Syndrome |
| OS-CS | Osteopathia Striata-cranial Sclerosis [syndrome] |
| OSAS | Obstructive Sleep Apnea Syndrome |
| OU | Observation Unit; Oppenheimer-Urbach [syndrome] |
| OUS | Overuse Syndrome |
| OWR | Osler-Weber-Rendu [syndrome]; Ovarian Wedge Resection |
| OWS | Outerwear Syndrome |
| PAC | Pericarditis-arthropathy-camptodactyly [syndrome] |
| PACT | Prospective Acute Coronary Syndrome Trial |
| PAGOD | Pulmonary Hypoplasia-hypoplasia Of Pulmonary Artery-agonadism-omphalocele/diaphragmatic Defect-dextrocardia [syndrome] |
| PAIDS | Paralyzed Academic Investigator's Disease Syndrome; Pediatric Acquired Immunodeficiency Syndrome |
| PAIS | Partial Androgen Insensitivity Syndrome |
| PAIS | Pravastatin In Acute Ischemic Syndromes [study] |
| PALS | Prison-acquired Lymphoproliferative Syndrome |
| PANSS | Positive And Negative Syndrome Scale |
| PAPS | 3´-phosphoadenosine-5´-phosphosulfate; Primary Antiphospholipid Antibody Syndrome |
| PARAGON | Platelet IIb/IIIa Antagonist For The Reduction Of Acute Coronary Syndrome Events In A Global Organization Network [study] |
| PAWS | Primary Withdrawal Syndrome |
| PBS | Perfusion-pressure Breakthrough Syndrome |
| PBS | Prune Belly Syndrome |
| PCIS | Patient-Care Information System; Point-of-care Information System; Postcardiac Injury Syndrome |
| PCOS | Polycystic Ovary Syndrome |
| PCS | Pelvic Congestion Syndrome |
| PCS | Pharmacogenic Confusional Syndrome |
| PCS | Postcardiotomy Syndrome |
| PCS | Postcholecystectomy Syndrome |
| PCS | Postconcussion Syndrome |
| PCS | Prolonged Crush Syndrome |
| PD/AR | Photosensitivity Dermatitis And Actinic Reticuloid Syndrome |
| PDGS | Partial Form Of DiGeorge Syndrome |
| PDS | Pain-dysfunction Syndrome |
| PDSG | Pigment Dispersion Syndrome Glaucoma |
| PEAS | Patient Education And Activation System; Possible Estuary-associated Syndrome |
| PEHO | Progressive Encephalopathy-edema-hypsarrhythmia-optic Atrophy [syndrome] |
| PEP | Pigmentation, Edema, And Plasma Cell Dyscrasia [syndrome] |
| PES | Physical Examination Syndrome |
| PES | Preexcitation Syndrome |
| PES | Primary Empty Sella [syndrome] |
| PES | Pseudoexfoliation Or Pseudoexfoliative Syndrome |
| PFPS | Patellofemoral Pain Syndrome |
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