| OFD | object-film distance; occipital frontal diameter; oro-facial-digital [syndrome] |
|---|---|
| PD | Doctor of Pharmacy; Dublin Pharmacopoeia; interpupillary distance; Paget disease; pancreatic duct; p... |
| p | Greek lower case letter pi; the ratio of circumference to diameter, 3.1415926536 |
| RAD | radial artery catheter; radiation absorbed dose; radical; radiography or radiographic; reactive airw... |
| RVEDD | right ventricular end-diastolic diameter |