| PA | partial pressure of arterial fluid |
|---|---|
| PAA | partial agonist activity; phenylacetic acid; phosphonoacetic acid; physical abilities analysis; plas... |
| PACO2 | partial pressure of carbon dioxide in alveolar gas |
| PaCO2 | partial pressure of carbon dioxide in arterial blood |
| PAIS | partial androgen insensitivity syndrome; phosphoribosylaminoimidazole synthetase; psychosocial adjus... |