| Abbreviation | Definition |
|---|---|
| PCO | Posterior Capsular Opacity |
| PCO2 | Partial Pressure of Carbon Dioxide |
| PCR | Protein Catabolic Rate |
| PCR | Protein Creatinine Ratio |
| PCRL | Photonics Communications Research Laboratory |
| PCRL | Powertrain Control Research Laboratory |
| PCSL | Physics of Complex Systems Laboratory |
| PCSL | Precision Compliant Systems Laboratory |
| PCV | PolyCythemia Vera |
| PCVL | Process Control Virtual Laboratory |
| PCY | p-CYmene |
| PCYDP | p-CYmene Degradation Pathway |
| PDA | Photo Diode Array |
| PDAI | Pouchitis Disease Activity Index |
| PDE | Permitted Daily Exposure |
| PDE | Phosphodiesterase |
| PDE5 | phosphodiesterase type 5 |
| PDGF | Platelet Derived Growth Factor |
| PDH | Pyruvate DeHydrogenase |
| PDL | Progressively Diffused Leukoencephalopathy |