| Abbreviation | Definition |
|---|---|
| PAL | Portable Audio Laboratory |
| PAL | Public Archaeology Laboratory |
| PAMP | Pathogen-Associated Molecular Pattern |
| PAMP(s) | pathogen-associated molecular pattern(s) |
| PAP | PAPanicolaou exam |
| PAP | PhenolAminoPhenazone |
| PAP | Prostatic Acid Phosphatase |
| PAPS | PhosphoAdenylyl PhosphoSulfate |
| PARL | Parallel Architecture Research Laboratory |
| PAS | ParAminobenzoic Sulphate |
| PAS | periodic-acid-Schiff |
| PAS | Publicly Assessed Subjects |
| PASP | Provincial Antigen Screening Program |
| PAT | Phosphinothricin Acetyl Transferase |
| PAT | Process Analytical Technologies |
| PATH | Professional Association of Therapeutic Horsemanship |
| PATL | Patrol Aircraft Test Laboratory |
| PATL | Product Application Test Laboratory |
| PB3 | Thyroglobulin |
| PBBL | Peripheral blood B lymphocytes |