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| Abbrev. | Meaning |
|---|---|
| Na | sodium (from Latin natrium) |
| NABS | normoactive bowel sounds |
| NAD | no abnormality detected no apparent distress (and many variations of the above) |
| NAD+ | nicotinamide adenine dinucleotide |
| NAS | no added salt |
| NB | newborn (infant) note well (please pay attention) (from Latin nota bene) |
| NBN | newborn nursery |
| NBTE | nonbacterial thrombotic endocarditis |
| NC | nerve action potential nasal cannula |
| NCC | noncompaction cardiomyopathy |
| NCS | nerve conduction study |
| NCT | nerve conduction test, aka nerve conduction study |
| NCV | nerve conduction velocity (see nerve conduction study) |
| ND | (examination) not done |
| NE | norepinephrine |
| Ne | neutrophil granulocytes |
| NEC | not elsewhere classified neonatal necrotizing enterocolitis |
| Neg | negative |
| Neo | neoplasm |
| NES | not elsewhere specified |
| NFR | not for resuscitation |
| NGT NG tube |
nasogastric tube (see intubation) |
| NGTD | negative to date |
| NGU | nongonococcal urethritis |
| NHL | non-Hodgkin lymphoma |
| NICU | neonatal intensive care unit |
| NIDDM | non-insulin-dependent diabetes mellitus |
| NK NK cells |
natural killer cells |
| NKA | no known allergies |
| NKDA | no known drug allergies |
| Nl | normal |
| NLP | no light perception (highest degree of blindness) |
| NM | nuclear medicine |
| NMR | nuclear magnetic resonance |
| NNH | number needed to harm |
| NNT | number needed to treat |
| NO | nitric oxide |
| No. | number |
| NOF | neck of femur fracture (refers to hip fracture) |
| Non rep. | do not repeat |
| NOS | nitric oxide synthase; not otherwise specified |
| NPA | nasal pharyngeal aspirate |
| NPH | normal pressure hydrocephalus |
| Npl | neoplasm |
| NPO | nil per os (nothing by mouth) |
| NPTAC | no previous tracing available for comparison |
| NRB | non-rebreather mask |
| NRBC | nucleated red blood cells |
| NREM | non–rapid eye movement |
| n.s. | not significant |
| NS | normal saline |
| NSA | no significant abnormality |
| NSAID | nonsteroidal antiinflammatory drug |
| NSCC | Non-squamous-cell carcinoma |
| NSCLC | non–small cell lung carcinoma |
| NSD | normal spontaneous delivery (see childbirth) |
| NSE | neurospecific enolase |
| NSR | normal sinus rhythm |
| NST | non-stress test (see cardiotocograph) |
| NSTEMI | non-ST-elevation myocardial infarction |
| NSU | nonspecific urethritis |
| NT | not tested |
| NTG | nitroglycerin |
| NTT | nasotracheal tube (see intubation) |
| N&V n/v |
nausea and vomiting |
| NVD | normal vaginal delivery (see childbirth); nausea, vomiting, and diarrhea |
| NVDC | nausea, vomiting, diarrhea, and constipation |
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