I've used ZRT a few times.
I kind of like the labs from Integrative Psychitry now, because they also test Epinephrine, NorEpinephrine, Dopamine, Seratonin, GABA and a few more.
It gives you a more complete picture. The bottom of this page shows how neurotransmitters are affected with Adrenal Fatigue.
Wow...they have a lot more choices since the last time I ordered from them.
This is the one I have ordered the last couple of times...not cheap @ $339. But it's nice to see how your neurotransmitters are affected by Adrenal Fatigue.
This one is a little cheaper. ($192) Plus it test Progesterone and Androstenedione. If this is your first test, this might be all that you need.