| MOTT | mycobacteria other than tuberculosis |
|---|---|
| OHE | other hospital employee |
| OND | Ophthalmic Nursing Diploma; orbitonasal dislocation; other neurological disorders |
| OPL | other party liability; outer plexiform layer; ovine placental lactogen |
| ORM | orosomucoid; other regulated material; oxygen ratio monitor |