| PAFI | platelet-aggregation factor inhibitor |
|---|---|
| PAI | patient assessment instrument; plasminogen activator inhibitor |
| PAI-1 | plasminogen-activator inhibitor-1 |
| PCI | patient classification index; pneumatosis cystoides intestinales; prophylactic cranial irradiation; ... |
| PGSI | prostaglandin synthetase inhibitor |