| IUPAC | International Union of Pure and Applied Chemistry |
|---|---|
| IUPAP | International Union of Pure and Applied Physics |
| PPA | palpation, percussion, auscultation; pepsin A; phenylpropanolamine; phenylpyruvic acid; Pittsburgh p... |
| PRCA | pure red cell aplasia |
| PSS | painful shoulder syndrome; physiologic saline solution; porcine stress syndrome; primary Sjogren syn... |