| OATS | Oat, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | Fecal Occult Blood | Occult Blood FMH Laboratory | 
      
        | OLIGS | Oligoclonal Banding, Serum Mayo Clinic Laboratories in Rochester | 
      
        | OLIG | Oligoclonal Banding, Serum and Spinal Fluid Mayo Clinic Laboratories in Rochester | 
      
        | OLIGC | Oligoclonal Banding, Spinal Fluid Mayo Clinic Laboratories in Rochester | 
      
        | ONIN | Onion, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | OPATU | Opiates Confirmation, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | OPIU | Opiates Drug Screen Urine FMH Laboratory | 
      
        | FOPIA | Opiates, Serum or Plasma, Quantitative ARUP Laboratories | 
      
        | ORNG | Orange, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | ORCH | Orchard Grass, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | OREG | Oregano, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | OAU | Organic Acids Screen, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | OAUS | Organic Acids Screen, Urine Spot Mayo Clinic Laboratories in Rochester | 
      
        | IDENT | Organism Referred for Identification, Aerobic Bacteria Mayo Clinic Laboratories in Rochester | 
      
        | ANIDE | Organism Referred for Identification, Anaerobic Bacteria Mayo Clinic Laboratories in Rochester | 
      
        | C Oralpharyngeal | Oropharyngeal Culture FMH Microbiology | 
      
        | OTP | Orthopedia Homeobox Protein (OTP) Immunostain, Technical Component Only Mayo Clinic Laboratories in Rochester | 
      
        | ORTHP | Orthostatic Proteinuria, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | OSMOS | Osmolality Serum FMH Laboratory | 
      
        | OSMOU | Osmolality Urine FMH Laboratory | 
      
        | OSM24 | Osmolality, 24 Hour, Urine Mayo Clinic Laboratories in Rochester | 
      
        | OSMOF | Osmolality, Feces Mayo Clinic Laboratories in Rochester | 
      
        | OSG_F | Osmotic Gap, Feces Mayo Clinic Laboratories in Rochester | 
      
        | OIBFG | Osteogenesis Imperfecta and Bone Fragility Gene Panel, Varies Mayo Clinic Laboratories in Rochester |