List of medical abbreviations: N

Sortable table

Abbreviation	Meaning
Nφ	Neutrophil
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
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
NGU	nongonococcal urethritis
NH	nursing home
NHL	non-Hodgkin lymphoma
NHW	non-healing wound
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
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
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
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