| PAO | peak acid output; peripheral airway obstruction; plasma amine oxidase; polyamine oxidase; pulmonary ... |
|---|---|
| PVO | pulmonary venous obstruction |
| SBO | small bowel obstruction; spina bifida occulta |
| SCJ | squamocolumnar junction; sternoclavicular joint; sternocostal joint |
| SPJ | saphenopopliteal junction |