| 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 |