An increased AST level is usually a sign of liver disease. Liver disease is even more likely when the levels of substances checked by other liver blood tests have also increased. An increased AST level may be due to any of the following:
In order to keep itself fresh, the lettuce gives off carbon dioxide, causing a slight odour. This carbon dioxide is not harmful and the odour should disappear quickly once the salad package is opened.
1 Clean lettuce thoroughly and wrap in paper towels to absorb moisture. Refrigerate until crisp, at least 1 hour or more.  In a bowl or jar combine oil, vinegar, Worcestershire sauce, salt, mustard, garlic and lemon juice. Whisk until well blended.