| Abbreviations | Meaning |
 | PBA | Polyclonal B-cell Activity; Pressure Breathing Assist; Prolactin-binding Assay; Prune Belly Anomaly; Pulpobuccoaxial |
| PBC | Peripheral Blood Cell |
| PBCH | Polymorphic B-cell Hyperplasia |
| PBCL | Polymorphic B-cell Lymphoma |
| PBM | Peak Bone Mass; Peripheral Basement Membrane; Peripheral Blood Mononuclear [cell]; Placental Basement Membrane |
| PBMC | Peripheral Blood Mononuclear Cells |
| PBMC | Peripheral Blood Mononuclear Cell; Pharmaceutical Benefit Management Company |
| PBMNC | Peripheral Blood Mononuclear Cell |
| PBPC | Peripheral Blood Progenitor Cells |
| PBPC | Peripheral Blood Progenitor Cell; Progressive Bulbar Palsy Of Childhood |
| PBSC | Peripheral Blood Stem Cell |
| PBSCT | Peripheral Blood Stem Cell Transplantation |
| PC | Plasma Cells |
| PC | Packed Cells |
| PC | Parent Cell |
| PC | Peritoneal Cell |
| PCA | Parietal Cell Antibody |
| PCB | Production Cell Bank |
| PCC | Primary Cell Culture |
| PCD | Plasma Cell Dyscrasia |
| PCD | Programmed Cell Death |
| PCL | Packaging Cell Line |
| PCL | Plasma Cell Leukemia |
| PCLI | Bone Marrow Plasma Cell Labeling Index |
| PCLI | Plasma Cell Labeling Index |
| PCNA | Proliferating Cell Nuclear Antigen |
| PCV | Packed Cell Volume (hematocrit) |
| PCV | Packed Cell Volume; Polycythemia Vera; Porcine Circovirus; Postcapillary Venule; Pressure-control Ventilation |
| PCW | Pericanalicular Web; Personal Care Worker; Primary Capillary Wedge; Pulmonary Capillary Wedge; Purified Cell Walls |
| PD-ECGF | Platelet-derived Endothelial Cell Growth Factor |
| PDEC | Pancreatic Ductal Epithelial Cell |
| PEC | Peritoneal Exudate Cells |
| PEC | Perivascular Epithelioid Cell |
| PEC | Peritoneal Exudate Cell |
| PECAM | Platelet Endothelial Cell Adhesion Molecule |
| PECAM-1 | Platelet Endothelial Cell Adhesion Molecule (CD-31) |
| PEP | Pigmentation, Edema, And Plasma Cell Dyscrasia [syndrome] |
| PFC | Plaque-forming Cell |
| PGC | Pregastricin; Primordial Germ Cell |
| PGC | Progastricin; Primordial Germ Cell |
| PGCL | [nucleus] Paragigantocellularis Lateralis |
| PHC | Proliferative Helper Cell |
| PHCC | Primary Hepatocellular Carcinoma |
| PHI | Intracellular Hydrogen Ion Concentration; Intramucosal Hydrogen Ion Concentration |
| PHN | Papillary Hurthle Cell Neoplasms |
| PHSC | Pluripotential Hematopoietic Stem Cell |
| PHSC | Pleuripotent Hemopoietic Stem Cell; Powdered Human Stratum Corneum |
| PLCC | Primary Liver Cell Cancer |
| PLT | Paucity Of Lymph Node T Cell Mutation |
| PM | Postmitotic Cells |
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