| n | normal |
| N | Stickstoff |
| NAC | n-Acetylcystein |
| N.A.D. | no appreciable disease (o.p.B.) |
| NAD/ NADH | Nicotinamid-adenin-dinucleotid |
| NADP | Nicotinamid-adenin-dinucleotid-phosphat |
| NAFLD | Nichtalkohlische Fettlebererkrankung |
| NAP | Nervenaustrittspunkt |
| NARES | nonallergic rhinitis with eosinophilia syndrome |
| NARI | Noradrenalin-Reuptake-Inhibitor |
| NASH | Non alcoholic steatohepatitis |
| NASSA | Noradrenerges und spezifisch serotonerges Antidepressivum |
| NAW | Notarztwagen (81) |
| nb | nicht bestimmt, nicht bestimmbar |
| NBI | Narrow Band Imaging |
| NBR | Nucleotid Binding Region |
| NBT-Test | Nitroblautetrazoliumtest (Granulozytenfunktionstest) |
| NBX | Nierenbiopsie |
| NBZ | Nüchternblutzucker |
| NC | Zytostase mit Mitoxantron (Novantron), Cyclophosphamid |
| NC | negative control |
| NC | Neurochirurgie |
| NCBI | National Center for Biotechnology Information |
| NCI | non capillary (silk) (Nahtseide ohne Dochtwirkung) |
| NCI | National Cancer Institut |
| Ncl | Nucleus |
| ND | Neck dissection |
| NDV | newcastle disease virus |
| NEC | nekrotisierende Enterokolitis |
| NED | no evidence of disease |