I measure salivary cortisol all the time. 24-hour cortisol, while it can be useful in a study like this (only have to deal with one data point, total cortisol), is not as useful in actually treating subclinical adrenal issues.
Measuring the catecholamines isn't something I know of many practitioners doing regularly, unless they are looking for a very specific issue (ie. adrenal tumor).
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