| OATS | Oat, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | GASTOCC | OCCULT BLOOD, GASTRIC NRLS-Microbiology | 
      
        | OCCBLD/OCCBLDX3 | OCCULT BLOOD, STOOL NRLS-Microbiology | 
      
        | OKTXALLr | OK TX GENERAL ALLERGY PANEL RML NRLS-Regional Medical Lab | 
      
        | OLIG | Oligoclonal Banding, Serum and Spinal Fluid Mayo Clinic Laboratories in Rochester | 
      
        | UOPIS | OPIATE SCREEN, URINE NRLS-Core Chemistry | 
      
        | OPATU | Opiates Confirmation, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | ORNG | Orange, IgE, Serum Mayo Clinic Laboratories in Rochester | 
      
        | OAU | Organic Acids Screen, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | OSMOS | OSMOLALITY, SERUM NRLS-Core Serology | 
      
        | OSMOU | OSMOLALITY, URINE NRLS-Core Serology | 
      
        | FRAG | Osmotic Fragility, Erythrocytes Mayo Clinic Laboratories in Rochester | 
      
        | OSCAL | Osteocalcin, Serum Mayo Clinic Laboratories in Rochester | 
      
        | OPE | Ova and Parasite, Travel History or Immunocompromised, Feces Mayo Clinic Laboratories in Rochester | 
      
        | OP | OVA AND PARASITES, STOOL NRLS-Microbiology | 
      
        | OMHC | Oxcarbazepine Metabolite, Serum Mayo Clinic Laboratories in Rochester | 
      
        | UOXYCODO | OXYCODONE SCREEN, URINE NRLS-Core Chemistry |