| PTR | patellar tendon reflex; patient termination record; patient to return; peripheral total resistance; plasma transfusion reaction; prothrombin time ratio; psychotic trigger reaction |
|---|---|
| PTr | porcine trypsin |
| Ptr | intratracheal pressure |
| PTRA | percutaneous transluminal renal angioplasty |
| PTRIA | polystyrene-tube radioimmunoassay |
| Ptrx | pelvic traction |