| sig | sigmoidoscopy; significant |
|---|---|
| SS | disulfide; sacrosciatic; saline soak; saline solution; saliva sample; saliva substitute; Salmonella-... |
| (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 |