| DRID | double radial immunodiffusion; double radioisotope derivative |
|---|---|
| PERK | prospective evaluation of radial keratotomy [protocol] |
| PHAVER | pterygia-heart defects-autosomal recessive inheritance-vertebral defects-ear anomalies-radial defect... |
| Ra | radial; radium; radius |
| RAD | radial artery catheter; radiation absorbed dose; radical; radiography or radiographic; reactive airw... |