| PPT | parietal pleural tissue; partial prothrombin time; peak-to-peak threshold; Pfeiffer-Palm-Teller [syn... |
|---|---|
| RST | radiosensitivity test; reagin screen test; right sacrotransverse [fetal position]; rubrospinal tract... |
| RTF | resistance transfer factor; respiratory tract fluid |
| RTI | respiratory tract infection; reverse transcriptase inhibition |
| RURTI | recurrent upper respiratory tract infection |