| PTN | pain transmission neuron; pleiotrophin; posterior tibial nerve |
|---|---|
| PTT | partial thromboplastin time; particle transport time; posterior tibial tendon (transfer); prothrombi... |
| RPT | rapid pull-through; refractory period of transmission; Registered Physical Therapist; renal parenchy... |
| STEM | scanning transmission electron microscope; Society of Teachers of Emergency Medicine |
| t | Greek lower case letter tau; life [of radioisotope]; relaxation time; shear stress; spectral transmi... |