Neisseria gonorrhoeae by Transcription-Mediated Amplification (TMA) Neisseria meningitidis Tetravalent Antibodies (Serogroups A, C, W-135 and Y), IgG Neurofibromatosis Type 1 (NF1) Deletion/Duplication Neurofibromatosis Type 1 (NF1) Sequencing Neurofibromatosis Type 1 (NF1) Sequencing and Deletion/Duplication Neurofilament by Immunohistochemistry 5’Nucleotidase Neurokinin A (Substance K) (INACTIVE as of 04/06/15) N Antigen Typing – Patient Neuron Specific Enolase Naproxen, Serum or Plasma Neuron Specific Enolase, CSF Naproxen, Urine Neuron Specific Enolase, Polyclonal (NSE P) by Immunohistochemistry Napsin A by Immunohistochemistry Neuronal Cell Antibodies Quantitative, Serum Narcolepsy (HLA-DQB1*06:02) Genotyping Neuronal Cell Antibodies, CSF Natalizumab Antibodies Neuronal Nuclear Antibodies (Hu, Ri, Yo) IgG by Immunoblot