List of medical abbreviations: N

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Abbreviation Meaning
Na sodium (from Latin natrium)
NA negative appendectomy
NAAT nuclear acid amplification test
NABS normoactive bowel sounds
NAC n-acetyl cysteine
NAD no abnormality detected
no apparent distress
(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
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
NE norepinephrine
Ne neutrophil granulocytes
NEAP Net Endogenous Acid Production
NEC not elsewhere classified
necrotizing enterocolitis
Neg negative
Neo neoplasm
NES not elsewhere specified
NFR not for resuscitation
NG nasogastric
NGT
NG tube
nasogastric tube
NGTD negative to date
NGU nongonococcal urethritis
NHL non-Hodgkin lymphoma
NICU neonatal intensive care unit
NIDDM non-insulin-dependent diabetes mellitus
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
NPO nil per os (nothing by mouth)
NPPV noninvasive positive pressure ventilation
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
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
NSVD normal spontaneous vaginal delivery
NT not tested
nuchal translucency
NTD neural tube defect
NTG nitroglycerin
n/t numbness and tingling
NTP Nortriptyline
NTT nasotracheal tube (see intubation)
NTX N-telopeptide
N&V
n/v
nausea and vomiting
NVD normal vaginal delivery (see childbirth);
nausea, vomiting, and diarrhea
NVDC nausea, vomiting, diarrhea, and constipation
NWB Non-weight-bearing
NYD Not yet diagnosed
NYHA New York Heart Association