| 91398 | N-Telopeptide, Serum |
| 91247 | N-Telopeptide, Urine |
| 2620 | N-terminal prohormone brain natriuretic peptide |
| 1026 | NA, Serum |
| 1104 | NA, Urine Quant |
| 91420 | NAPA |
| 3745 | Nasal Smear |
| 91170 | Natural Killer Cell Profile |
| 2118 | Nebcin, Peak |
| 2122 | Nebcin, Trough |
| 91403 | Neisseria gonorrhea Antibody |
| 1130 | Neisseria gonorrhoeae, Aptima |
| 4022 | Neisseria gonorrhoeae, Culture |
| 93549 | Neuronal Nuclear Antibody (ANNA) IgG w/Reflex Titer + Immunoblot |
| 91107 | Neurontin |
| 91477 | Niacin |
| 91352 | Nicotine, Urine |
| 91170 | NK Cell Profile |
| 91077 | Nordiazepam |
| 91081 | Nordoxepin |
| 91242 | Norepinephrine, Plasma |
| 91049 | Norepinephrine, Urine Free |
| 91163 | Normetanephrines |
| 91341 | Normethsuximide |
| 91397 | Norovirus Antigen |
| 91172 | Nortriptyline |
| 91018 | Nortriptyline + Elavil |
| 91397 | Norwalk Virus Antigen |
| 91247 | NTX |
| 91398 | NTX, Serum |
| 91006 | Nucleotidase |
| 91192 | Nucleotide 20210G |
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