| Abbreviation | Meaning |
|---|---|
| Nφ | Neutrophil |
| Na | sodium (from Latin natrium) |
| NA | negative appendectomy |
| NAAT | |
| NABS | normoactive bowel sounds |
| NAC | n-acetyl cysteine |
| NaCl | sodium chloride (saline) |
| NAD | no abnormality detected no apparent distress no appreciable disease (and many variations of the above) |
| NAD+ | nicotinamide adenine dinucleotide |
| NAFLD | Non-alcoholic fatty liver disease |
| NAS | no added salt |
| NASH | Non-alcoholic steatohepatitis |
| NB | newborn (infant) note well (please pay attention) (from Latin nota bene) |
| NBN | newborn nursery |
| NBIA | neurodegeneration with brain iron accumulation |
| NBT | nitroblue tetrazolium |
| NBTE | nonbacterial thrombotic endocarditis |
| NC | nerve action potential nasal cannula |
| NCAT | Normocephalic, atraumatic; also written NC/AT |
| NCC | noncompaction cardiomyopathy |
| NCEP | National Cholesterol Education Program |
| NCS | nerve conduction study |
| NCT | nerve conduction test, aka nerve conduction study |
| NCV | nerve conduction velocity (see nerve conduction study) |
| ND | (examination) not done |
| NDI | nephrogenic diabetes insipidus |
| NDSC | National Decision Support Company |
| NE | norepinephrine |
| Ne | neutrophil granulocytes |
| NEAD | Non-epileptic attack disorder |
| NEAP | Net Endogenous Acid Production |
| NEC | not elsewhere classified necrotizing enterocolitis |
| NED | No evidence of disease |
| Neg | negative |
| Neo | neoplasm |
| NES | not elsewhere specified |
| NFR | not for resuscitation |
| NG | nasogastric |
| NGT NG tube | nasogastric tube |
| NGTD | negative to date / no growth to date |
| NGU | nongonococcal urethritis |
| NH | nursing home |
| NHL | non-Hodgkin lymphoma |
| NHW | non-healing wound |
| NICMP NICM | non-ischemic cardiomyopathy |
| NICU | neonatal intensive care unit |
| NIDDM | non-insulin-dependent diabetes mellitus |
| NIF | Negative inspiratory force |
| NIH | National Institutes of Health |
| NIPPV | Nasal intermittent positive pressure ventilation |
| 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) |
| NOMI | nonocclusive mesenteric ischemia |
| Non rep. | do not repeat |
| NOS | nitric oxide synthase; not otherwise specified |
| NPA | nasal pharyngeal aspirate |
| NPH | normal pressure hydrocephalus |
| Npl | neoplasm |
| NP | Nurse Practitioner |
| NPC | nasopharyngeal carcinoma |
| NPDR | Non-proliferative diabetic retinopathy |
| NPO | nil per os (nothing by mouth) |
| NPPV | noninvasive positive pressure ventilation |
| NPT | neuropsychiatric testing |
| NPTAC | no previous tracing available for comparison |
| NPV | negative predictive value |
| NRB | non-rebreather mask |
| NRBC | nucleated red blood cells |
| NREM | non–rapid eye movement |
| NRT | nicotine replacement therapy |
| n.s. | not significant |
| NS | normal saline |
| NSA | no significant abnormality |
| NSAID | nonsteroidal antiinflammatory drug |
| NSBB | Non-selective beta blocker |
| NSCC | Non-squamous-cell carcinoma |
| NSCLC | non–small cell lung carcinoma |
| NSD | normal spontaneous delivery (see childbirth) |
| NSE | neurospecific enolase |
| NSIP | Non-specific interstitial pneumonia |
| NSR | normal sinus rhythm |
| NST | non-stress test (see cardiotocograph) |
| NSTEMI | non-ST-elevation myocardial infarction |
| NSU | nonspecific urethritis |
| NSVD | normal spontaneous vaginal delivery |
| NT | not tested nontender nuchal translucency |
| NTBS | needs to be seen |
| NTD | neural tube defect |
| NTG | nitroglycerin |
| n/t | numbness and tingling |
| NTP | Nortriptyline |
| NTS | nucleus tractus solitarii, or Solitary nucleus |
| NTT | nasotracheal tube (see intubation) |
| NTX | N-telopeptide |
| nu | in each nostril |
| N&V n/v | nausea and vomiting |
| NVD | normal vaginal delivery (see childbirth); nausea, vomiting, and diarrhea |
| NVDC | nausea, vomiting, diarrhea, and constipation |
| NVI | Neurovascularly Intact, Neurovascular Injury, Neurovascular Impairment |
| NVID | Neurovascularly intact distally |
| NWB | Non-weight-bearing |
| NYD | Not yet diagnosed |
| NYHA | New York Heart Association |
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