Yes, that is what my doc uses, Labrix. That is what I've used the last 2 times. She says it is the best. So, even though she said ZRT wasn't good, I thought the results were rather comparable. They just have a different scaling system, but in my opinion, low is low, and high is high, so I didn't really see the difference. Both tests showed that I had almost no cortisol!! And ZRT was very helpful when I called to talk with them.