| Abbreviation | Definition |
|---|---|
| PIRL | Planetary Image Research Laboratory |
| PIRL | Preclinical Imaging and Research Laboratories |
| PK | PharmacoKinetics |
| PKU | PhenylKetonUria |
| PL | Participant Life |
| PLA | Proprietary Laboratory Analyses |
| PLAIC | Purdue Laboratory for Applied Industrial Control (West Lafayette, IN) |
| PLDL | Análisis de lipidos |
| PLE | Pymatuning Laboratory of Ecology |
| PLESS | Princeton Laboratory for Experimental Social Science |
| PLI | Paternal Leukocyte Immunization |
| PLIM | Pharmacopoeial Laboratory for Indian Medicine |
| PLIS | Provincial Laboratory Information Solution |
| PLMS | Pathology Laboratory Medicine Service |
| PLNA | Provincial Laboratory of Northern Alberta |
| PLR | Protein Laboratories Rehovot |
| PLRS | Professional Laboratory and Research Services |
| PLS | Projection to Latent Structures |
| plt | platelet |
| Plts | Platelets |