| YNMDA | N-methyl-D-Aspartate Receptor Antibody, IgG | — |
| YNMTHUR | N-Methylhistamine, 24-Hour Urine | — |
| YNMTHR | N-Methylhistamine, Random Urine | — |
| YNTXU | N-Telopeptide Cross Linked (NTx) Random or 24 Hr. Urine | — |
| YSNTP | N-Telopeptide, Cross-Linked, Serum | — |
| YCGMGN | N. Gonorrhoeae, Chlamydia & Mycoplasma Genitalium NAAT | Nucleic Acid Amplification Testing |
| YGCCMGN | N. Gonorrhoeae, Chlamydia, Trichomonas & Mycoplasma Genitalium NAAT | Nucleic Acid Amplification Testing |
| YIFBETA | NAbFeron Neutralizing Antibody | — |
| YNRCY | Narcolepsy Evaluation, HLA DQ6 by DNA | — |
| YNSFIB | NASH FibroTest | — |
| YNKNKT | Natural Killer Cell and Natural Killer T-Cell Panel | Semi-Quantitative Flow Cytometry |
| YNKCE | Natural Killer Cells Enumeration | — |
| YNAVYBN | Navy Bean IgE | — |
| YMNVR | Neisseria meningitidis (Meningococcal) IgG Vaccine Response | — |
| YNPTRN | Neopterin, Serum | — |
| YNETTLE | Nettle Weed IgE | — |
| YNF1Z | Neurofibromatosis Type 1, NF1, Full Gene Analysis | — |
| YNFLC | Neurofilament Light Chain, Plasma | — |
| YNMOGA | Neuromyelitis Optica (NMO)/Aquaporin-4-IgG Fluorescence-Activated Cell Sorting (FACS) Assay, Serum | — |
| YNSES | Neuron Specific Enolase (NSE) | — |
| YANNA | Neuronal Abs (Hu, Ri, Yo, Tr/DNER), IgG | Qualitative Immunoblot / Semi-Quantitative Indirect Fluorescent Antibody (IFA) |
| YNAAB | Neutrophil Associated Antibodies | — |
| YNOBA | Neutrophil Oxidative Burst Assay (DHR) | — |
| YNGSHM | NGS for Myeloid Neoplasms | — |
| YNCKL | Nickel, Serum | Quantitative Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) |
| YNICTN | Nicotine & Metabolites, Serum | — |
| YNICU | Nicotine Metabolite, Urine | — |
| YLIPOPR | NMR Lipoprofile | — |
| YNOCCU | Nocardia Culture | — |
| YNCASAB | Non-Criteria APS Syndrome (aPs, aPt, aPs/aPt) AB Panel | — |
| YNORT | Nortriptyline | — |
| YNVDET | Norwalk Virus Detection (Norovirus) | — |
| YNPM1 | NPM1 Mutation Detection | — |
| YPBNP | NT-proBNP | — |
