ZRT Laboratory Clinical Consultants
Experienced clinicians to answer health care provider questions is another benefit of working with ZRT Laboratory.
Our docs are available Monday through Friday 9:00am - 5:00pm – free of charge – to answer questions including who to test, when to test, how to interpret our results and how to handle your most challenging hormone cases.
Founder Of ZRT Laboratory, Dr. David Zava

Dr. David Zava, a biochemist by trade and a teacher at heart, is animated when he talks about his work. He didn’t start out trying to build a company — as a researcher, he wanted to provide health care practitioners and patients with a deeper understanding of the role hormones play in wellness.
The more he studied, the more test results he reviewed, and the more patient stories he heard, the more he knew he needed to channel his knowledge into something that enables people to be actively involved in their own health.
To this day, he’s continually searching to understand more fully how the world around us impacts our wellbeing, and how our lifestyle choices, environment and genetics impact the delicate balance of our hormones.
His hands-on approach trickles down through ZRT Laboratory, so much so that the company is renowned for the way it supports people and their health on such a personal level.
“There is no other reason to keep doing the work unless we find out a way to make the world a better place.”
ZRT Laboratory embodies Dr. Zava’s vision, and is recognized the world over as a team devoted to providing the most accurate results with the most educated insight into their meaning.

Dr. Alison McAllister is the lead clinical consultant for ZRT. She sees patients in her own practice several days a week, and has worked with ZRT for over 17 years – helping hundreds of doctors understand hormone balance and the role that hormones, neurotransmitters and elements play in overall health. She is an expert in thyroid function, fertility and PCOS. In addition, Dr. McAllister also regularly lectures for groups such as the A4M and IFM at industry conferences.

Dr. Sherry LaBeck has been with ZRT for over 12 years. Prior to being a clinical consultant she taught at the National University of Natural Medicine in Portland OR and the Southwest College of Naturopathic Medicine in Tempe AZ. Her mission is to continue to expand education about hormones for health care providers around the country.

Dr. Beth Baldwin earned her N.D. at Bastyr University. She has since worked in private practice, community health and clinical research, focusing on women’s health throughout the lifespan, bioidentical hormone replacement and neurodevelopmental disorders. As a member of ZRT Laboratory’s Clinical Consultant team, Dr. Baldwin shares her knowledge to promote safe approaches to hormonal health.