| SSD | shaded surface display; single saturating dose; Social Security disability; source-skin distance; so... |
|---|---|
| CTH | Chronic Tension Headache |
| (A-a)DN2 | alveolo-arterial nitrogen tension difference |
| AADO2, (a-A) DO2 | arterio-alveolar oxygen tension difference |
| A-a O2 | alveolo-arterial oxygen tension |