Test Code Test Name
OVAPR O & P Routine
OAWH Oak White (T7), IgE
OAIGE Oat (F7) IgE
OCCDIA Occult Blood, Diagnostic 
Used for Diagnostic purposes see test code OCCSCR for screening test.
OCCSCR Occult Blood, Screening
Used for Screening purposes see test code OCCDIA for diagnostic test.
OCTOPS Octopus (f59) IgE [2622]
OLANZA Olanzapine [70073]
OLIGO Oligoclonal Bands (IgG), CSF [674]
OMEGA Omega-3 and -6 Fatty Acids [91001]
ONIGE Onion (F48), IgE
OPILC Opiate Metabolites Confirmation
PMOPCF Opiates w/ Confirmation
UOPCF Opiates w/ Confirmation
PMOPQ Opiates, Qualitative
UOP Opiates, Qualitative
ORANGE Orange (f33) IgE [2833X]
ORGR Orchard Grass (Cocksfoot) (G3), IgE
OREGNO Oregano (Rf283) IgE** [3045X]
OSMOF Osmolality, Feces [968]
OSMOS Osmolality, Serum
OSMOU Osmolality, Urine
OSTEOC Osteocalcin, N-MID [16322]
OP1 Ova & Parasite Traveler's Screen (Sample #1)
OP2 OVA & PARASITE TRAVELER'S SCREEN (Sample #2)
OP3 OVA & PARASITE TRAVELER'S SCREEN (Sample #3)
OVALE Ovalbumin (F232) IgE
OVABS Ovarian Antibody Screen with Reflex to Titer, IFA
OVOMUC Ovomucoid (f233) IgE [3046]
OXAL24 Oxalic Acid, 24-Hour Urine with Creatinine  [682X]
OXALIC Oxalic Acid, 24-Hour Urine without Creatinine
OXA24C Oxalic Acid, Adult, Urine with Creatinine [10456X]
OXCARB Oxcarbazepine Metabolite [36637]
UOXYCF Oxycodone & Metabolites
OXMETV Oxycodone and Metabolite, Quantitative, Serum [18885]
OXYLC Oxycodone Confirmation
OXYCF Oxycodone w/ Confirmation
UOXY Oxycodone, Qualitative
OYSTER Oyster (f290) IgE [8932X]