| NIRS | near-infrared spectroscopy; normal inactivated rabbit serum |
|---|---|
| NKHS | nonketotic hyperosmolar syndrome; normal Krebs-Henseleit solution |
| nl | nanoliter; normal [value] |
| NLA | National Leukemia Association; neuroleptoanesthesia; normal lactase activity |
| NLDL | normal low-density lipoprotein |