| KBG | syndrome of multiple abnormalities designated with the original patient's initials |
|---|---|
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |
| OEM | opposite ear masked; original electronic manufacturer |
| OT | objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular ... |
| PTO | Klemperer's tuberculin [Ger. Perlsucht Tuberculin Original] |