| Abbreviation | Definition |
|---|---|
| PAT | Process Analytical Technology Initiative |
| PB | Planning Branch |
| PB(CDRH) | Planning Branch (CDRH) |
| PB(CFSAN) | Pathology Branch (Center for Food Safety and Applied Nutrition) |
| PBM | Pharmacy Benefits Management |
| PBPC | Peripheral Blood Progenitor Cell |
| PBSC | Peripheral Blood Stem Cell |
| PCB | Placental Cord Blood |
| PCB | Poly-Chlorinated Biphenyl |
| PCBE | President's Council on BioEthics |
| PCBs | polychlorinated biphenyls |
| PCC | Poison Control Center |
| PCERT | Pre-clinical and Clinical Evaluation Review Template |
| PCP | Pneumocystis Carinii Pneumonia |
| PCR | Polymerase Chain Reaction |
| PCT | Photo-Chemical Treatment |
| PCT | Practical Clinical Trial |
| PD | PharmacoDynamics |
| PD | Position Description |
| PD | Product Dictionary |