| VSIE | volume surface integral equation [method] |
|---|---|
| (A-a)DN2 | alveolo-arterial nitrogen tension difference |
| AADO2, (a-A) DO2 | arterio-alveolar oxygen tension difference |
| AaPCO2, (A-a)PCO2 | alveolo-arterial carbon dioxide tension difference |
| AaPO2, (A-a) PO2 | alveolo-arterial oxygen tension difference |