| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |
|---|---|
| KBG | syndrome of multiple abnormalities designated with the original patient's initials |
| 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] |