| Abbreviation | Definition |
|---|---|
| PH | Pleckstrin Homology |
| PH3 | phosphine |
| PHDL | Public Health Dynamics Laboratory |
| PHEL | Public Health Entomology Laboratory |
| PHL | Pathology Histotechnology Laboratory |
| PHL | Planetary Habitability Laboratory |
| PHL | Public Health Laboratories |
| PHLC | Public Health Laboratory Centre |
| PHPH | phenolphthalein |
| PHQ | Preliminary Health Questionnaire |
| PHV | Psittacine Herpes Virus (Pacheco's Disease) |
| PHY | Physician |
| PI | Propidium Iodide |
| PIBL | Pulmonary Imaging and Bioengineering Laboratories |
| PIC | Pre-Initiation Complex |
| PIC | Punctate Inner Choroiditis |
| PIP | Project Investigator Patient |
| PIP | Proximal Inter Phalanx |
| PIPL | Positive Image Photographic Laboratory |
| PIRL | Phadia Immunology Reference Laboratory |