| PKU | Newborn Metabolic Screen RI State Health Department | 
      
        | NIS | Nickel, Serum Mayo Clinic Laboratories in Rochester | 
      
        | NICOU | Nicotine and Metabolites, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | NICOS | Nicotine and Metabolites, Serum Mayo Clinic Laboratories in Rochester | 
      
        | NSRGG | Noonan Syndrome and Related Conditions Gene Panel, Varies Mayo Clinic Laboratories in Rochester | 
      
        | NOTRP | Nortriptyline, Serum Mayo Clinic Laboratories in Rochester | 
      
        | NTC3Z | NOTCH3 Gene, Full Gene Analysis, Varies Mayo Clinic Laboratories in Rochester | 
      
        | PBNP1 | NT-Pro B-Type Natriuretic Peptide, Serum Mayo Clinic Laboratories in Rochester | 
      
        | NTRKM | NTRK Genes Mutation Analysis, Next-Generation Sequencing, Tumor Mayo Clinic Laboratories in Rochester | 
      
        | NMITO | Nuclear Mitochondrial Gene Panel, Next-Generation Sequencing, Varies Mayo Clinic Laboratories in Rochester | 
      
        | NMEG | Nutmeg, IgE, Serum Mayo Clinic Laboratories in Rochester |