| N | nitrogen |
| N/A | not applicable |
| N/C | no complaints |
| N/S, NS | normal saline |
| N/V, N&V | nausea and vomiting |
| Na | sodium |
| NA | nurse aide/assistant |
| NaCl | sodium chloride |
| NB | newborn |
| neg | negative |
| Neur | neurology |
| NG | nasogastric tube |
| NICU | neurological intensive care unit |
| NIDDM | non-insulin dependent diabetes mellitus |
| NIH | national institutes of health |
| nil | none |
| no | number |
| NO | nursing office |
| noc, noct | at night |
| NP | nurse practitioner |
| NPN | nonprotein nitrogen |
| NPO | nothing by mouth |
| Nsy | nursery |
| NVD | nausea, vomiting, diarrhea |
| NVS | neurological vital signs |
| O&P | ova and parasites |
| O2 | oxygen |
| Ob, Obs | obstetrics |
| OBRA | Omnibus Budget Reconciliation Act |
| od | overdose |
| OD | right eye (ocular dextra) Doctor of Optometry |
| oint | ointment |
| OJ | orange juice |
| OOB | out of bed |
| OP | outpatient |
| OPD, OPC | outpatient department or clinic |
| opp | opposite |
| OR | operating room |
| Ord | orderly |
| Orth | orthopedics |
| os | mouth |
| OS | left eye (occular sinister) |
| OSHA | Occupational Safety and Health Administration |
| OT | occupational therapist |
| OTC | over the counter |
| OU | each eye |
| OV | office visit |
| oz | ounce |
Drag corresponding items onto each other to make them disappear.
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