| PSA | parasternal short axis; pleomorphic salivary gland adenoma; polyethylene sulfonic acid; polysacchari... |
|---|---|
| RAD | radial artery catheter; radiation absorbed dose; radical; radiography or radiographic; reactive airw... |
| SAD | Scale of Anxiety and Depression; seasonal affective disorder; Self-Assessment Depression [scale]; se... |
| SAX | short axis; surface antigen, X-linked |
| SAx | short axis |