| BLOD0740 | Oak Allergen Sanford Laboratories Sioux Falls | 
      
        | BLOD0741 | Oat Allergen Sanford Laboratories Sioux Falls | 
      
        | BLOD5001 | OB Type and Screen - Prenatal Transfusion Service Sanford Bismarck | 
      
        | LBAN0013 | Oligoclonal Banding, Serum and Spinal Fluid Mayo Clinic Laboratories in Rochester | 
      
        | BLOD0262 | Onion Allergen Sanford Laboratories Sioux Falls | 
      
        | NBLD0409 | Opiate Screen, Urine Sanford Laboratories Bismarck | 
      
        | NBLD0556 | Opiates Confirmation, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | NBLD0556 | Opiates Confirmation, Urine Mayo Medical Laboratories | 
      
        | BLOD0742 | Orange Allergen Sanford Laboratories Sioux Falls | 
      
        | BLOD0743 | Orchard Grass Allergen Sanford Laboratories Sioux Falls | 
      
        | NBLD0041 | Organic Acids Screen, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | NBLD0415 | Orotic Acid, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | BLOD0617 | Osmolality Sanford Laboratories Bismarck | 
      
        | NBLD0190 | Osmolality, Urine Sanford Laboratories Bismarck | 
      
        | BLOD0119 | Osmotic Fragility, Erythrocytes Mayo Clinic Laboratories in Rochester | 
      
        | BLOD0196 | Osteocalcin, Serum Mayo Clinic Laboratories in Rochester | 
      
        | MICR0011 | Ova and Parasite Comprehensive Exam North Dakota Public Health Laboratory | 
      
        | BLOD1274 | Ovarian Antibody Screen Reflex to Titer Quest Chantilly | 
      
        | NBLD0076 | Oxalate, 24 Hour, Urine Mayo Clinic Laboratories in Rochester | 
      
        | BLOD1720 | Oxalate, Plasma Mayo Clinic Laboratories in Rochester | 
      
        | NBLD0565 | Oxalate, Random, Urine Mayo Clinic Laboratories in Rochester | 
      
        | BLOD0053 | Oxcarbazepine Metabolite, Serum Mayo Clinic Laboratories in Rochester | 
      
        | BLOD1780 | OxLDL Quest Chantilly | 
      
        | NBLD0616 | Oxycodone Screen, Urine Sanford Laboratories Bismarck | 
      
        | BLOD1702 | Oxysterols, Plasma Mayo Clinic Laboratories in Rochester |