• 7721 OAK IgE
• 7779 OAT IgE
• 1050 OCCULT BLOOD, FECAL
• 1259 OCCULT BLOOD, FECAL, IMMUNOASSAY (FIOBT)
• 6613 OLANZAPINE (ZYPREXA)
• 6958 OLIGOCLONAL BANDING
• 8384 OLIVE IgE
• 7788 ONION IgE
• 1743 OPIATE CONFIRMATION, URINE
• 8346 ORANGE IgE
• 7735 ORCHARD GRASS (COCKSFOOT) IgE
• 7789 OREGANO IgE
• 3107 ORGANIC ACID ANALYSIS, URINE
• 4030 ORGANISM IDENTIFICATION, MOLD
• 2048 OSMOLALITY
• 2054 OSMOLALITY, FECAL
• 5236 OSMOLALITY, URINE
• 2086 OSMOTIC FRAGILITY ERYTHROCYTE
• 5186 OSTEOCALCIN, SERUM
• 5010 OVA & PARASITES, STOOL
• 2632 OVALBUMIN IgE
• 6712 OVARY ANTIBODY IGG
• 2634 OVOMUCOID IGE
• 6107 OXALATE, QUANT, 24-HOUR URINE
• 6036 OXAZEPAM (SERAX)
• 5810 OXCARBAZEPINE (TRILEPTAL),S
• 6756 OXYCODONE AND METABOLITE
• 1770 OXYCODONE QN,URINE
• 6482 OXYCODONE/OXYMORPHONE, URINE
• 7790 OYSTER IGE