| A | B |
|---|
| Ped | pediatric; pediatrician |
| per os | by mouth |
| PERL | pupils equal and reactive to light |
| PERLA | pupils equal and reactive to light and accommodation |
| PET Scan | positron emission tomography |
| PFT | pulmonary function test |
| pH | symbol for expression of concentration of hydrogen ions (degree of acidity) |
| PICC Line | peripherally inserted central catheter for delivery of medication into the bloodstream |
| PICU | pediatric intensive care unit |
| PIMU | pediatric intermediate or "step down" unit |
