75480	Occult Blood
99334	Olanzapine (Zyprexa)
71200	Opiates, Urine
99174	Osmolality, Serum
99176	Osmolality, Urine
75500	Ova & Parasites
99068	Oxalate 24 hour Urine
99238	Oxazepam (Temazepam)