N-terminal pro B-type natriuretic peptide see NT-proBNP
Nail clippings (mycology) see scrapings/ clippings for mycological investigation
NEFA see free fatty acids
Neuromyelitis optica antibody (NMO) see aquaporin 4 antibody
Neurone-specific enolase see NSE
Neurontin see gabapentin
Neurotensin see gut hormones
Neutrophils see FBC
NK cell counts see lymphocyte subsets (B, T, NK cell counts)
NMO antibody see aquaporin 4 antibody
Non-HDL cholesterol see lipid profile
Noradrenaline, urine see catecholamines (urine)
Normetadrenaline (normetanephrine) see metadrenalines (urine),, metadrenalines (plasma)
Norovirus see gastroenteritis PCR
NSE (neurone-specific enolase)
NT-proBNP (N-terminal pro B-type natriuretic peptide)
Nucleated red blood cells (NRBC) see FBC