| OCA | oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent |
|---|---|
| PAM | pancreatic acinar mass; penicillin aluminum monostearate; peptidylglycine alpha-amidating monooxygen... |
| papova | papilloma-polyoma-vacuolating agent [virus] |
| PPA | palpation, percussion, auscultation; pepsin A; phenylpropanolamine; phenylpyruvic acid; Pittsburgh p... |
| PTFA | prothrombin time fixing agent |