I got my test kit from my chiropractor/kinesiologist. It involved taking four samples from 8-9 AM up to 11-12 PM. I can't remember the exact procedure because I have taken several of these in-home tests recently involving saliva/urine. I believe the first sample or two are fasting samples, but I believe that at least one required food to be eaten within a couple of hours of the sample. I believe that you can order one of these test kits on the internet and send it to the lab and get the results. I would google "adrenal saliva kits". Here is one site I found.
Some test kits require you to go through a doctor or pay a "consultation" fee to one of their doctors to take the test. Not just this test but other tests as well. I have had several tests done recently and none of the labs would tell me the results. I had to wait for them to send them to my guy and then wait for him to send them to me.