| JAKXB | JAK2 Exon 12 and Other Non-V617F Mutation Detection, Blood Mayo Clinic Laboratories in Rochester | 
      
        | JAKXR | JAK2 Exon 12-15 Sequencing, Polycythemia Vera Reflex, Varies Mayo Clinic Laboratories in Rochester | 
      
        | JAK2B | JAK2 V617F Mutation Detection, Blood Mayo Clinic Laboratories in Rochester | 
      
        | JCPCR | JC Virus, Molecular Detection, PCR, Spinal Fluid Mayo Clinic Laboratories in Rochester | 
      
        | JO1 | Jo 1 Antibodies, IgG, Serum Mayo Clinic Laboratories in Rochester | 
      
        | JIP | Joint Infection Panel, PCR, Synovial Fluid Mayo Clinic Laboratories in Rochester | 
      
        | JUNE | June Grass, IgE, Serum Mayo Clinic Laboratories in Rochester |