| Acronym | Meaning |
 | NKHC | Non-Ketotic Hyperglycemic Coma |
| NKHHC | NonKetonic Hyperglycemic-Hyperosmolar Coma |
| NKMA | No Known Medcation Allergies |
| NOS | Not Otherwise Specified |
| NPA | Nasopharyngeal Airway |
| NPD | Nightly Peritoneal Dialysis |
| NPO | Nothing By Mouth |
| NPQ | Not Physically Qualified |
| NS | Normal Saline (IV) |
| NSAID | Nonsteroidal Anti-inflammatory Drug |
| NSR | Normal Sinus Rythym (cardiac) |
| NT | NasoTracheal |
| NTD | Neural Tube Defect |
| NV | Nausea & Vomiting |
| NWB | NON-WEIGHT BEARING |
| NYD | Not Yet Diagnosed |
| O2 | Oxygen |
| OD | Right Eye |
| OD | Overdose |
| OGTT | Oral Glucose Tolerance Test |
| OPA | Oropharyngeal Airway |
| ORIF | Open Reduction Internal Fixation |
| OS | Left Eye |
| OU | Both Eyes |
| PABA | Para-Aminobenzoic Acid |
| PABA | Para-aminobenzoic Acid |
| PAD | Peripheral Arterial Disease |
| PC | After Meals |
| PCA | Patient Controlled Analgesia |
| PCN | Penicillin |
| PCV | Packed Cell Volume |
| PD | Peritoneal Dialysis |
| PDA | Patent Ductus Arteriosus |
| PDD | Pervasive Development Disorder |
| PDR | Physician's Desk Reference |
| PE | Pulmonary Edema / Embolism |
| PEG | Percutaneous Endoscopic Gastrostomy |
| PEG | Percutaneous Endoscopic Gastrostomy |
| PEJ | Percutaneous Endoscopic Jejunostomy |
| PERL | Pupils Equal, Round, Reactive To Light |
| PERRLA | Pupils Equal, Round, Reactive To Light And Accommodation |
| PET | Positron Emission Tomography |
| PFT | Pulmonary Function Test |
| PG | Prostaglandin |
| PH | Past History |
| PH | Concentration Of Hydrogen Ions |
| PH.D. | Doctorate Of Philosophy |
| PI | Present Illness |
| PI | Present Illness |
| PICC | Peripherally Inserted Central Venous Catheter |
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