No it’s not and you don’t seem to understand the difference between a tests positive and negative predictive value.
It’s useless to diagnose adrenal insufficiency.
Please at least try to understand that even if a test is able to measure something accurately it doesn’t mean automatically that it’s a useful diagnostic assay.
Read this to understand the basics of what negative and positive predictive levels means.
http://sphweb.bumc.bu.edu/otlt/MPH-Modules/EP/EP713_Screening/EP713_Screening5.html
And as I am tired of responding to bro science bla bla I will stop here.