| ORT | object relations technique; operating room technician; oral rehydration therapy |
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| pAg | protein A-gold [technique] |
| PAST | periodic acid-Schiff technique |
| PERT | program evaluation review technique |
| RO | radiation oncology; radiation output; ratio of; relative odds; renal osteodystrophy; reverse osmosis... |
| lyme disease antibody | A blood test which measures for the presence of Lyme disease antibodies. A nonreactive or serum titre of less than 1:256 is normal. A rising titre over time is more diagnostic. False positives due occur in those with rheumatoid arthritis and lupus. (27 Sep 1997) |
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