| PaO2 | partial oxygen tension in arterial blood; partial pressure of oxygen in arterial blood |
|---|---|
| PH | parathyroid hormone; partial hepatectomy; partial hysterectomy; passive hemagglutination; past histo... |
| PS | pacemaker syndrome; paired stimulation; paradoxical sleep; paraspinal; parasympathetic; Parkinson sy... |
| CIA | chemiluminescent immunoassay; chymotrypsin inhibitor activity; colony-inhibiting activity; congenita... |
| ECA | electrical control activity; electrocardioanalyzer; endothelial cytotoxic activity; enterobacterial ... |