David Zava, PhD

Dr. David Zava, a biochemist by trade and a teacher at heart, has dedicated over 40 years to exploring the role of hormones in aging and disease. After completing his Ph.D. in biochemistry at the University of Tennessee in 1974, Dr. Zava conducted extensive research on hormones and breast cancer in Texas, Switzerland, California, and Oregon. In 1998, he founded ZRT Laboratory, a CLIA-certified laboratory that leads in developing innovative test methods to identify hormonal imbalances linked to debilitating symptoms, diminished quality of life, and increased risks for cancers and age-related diseases such as diabetes, cardiovascular disease, and dementia.

Dr. Zava's passion for teaching and research inspired him to help healthcare practitioners and patients truly understand how hormones impact wellness. The more he studied, reviewed test results, and listened to patient stories, the more he realized the need to channel his knowledge into empowering individuals to actively manage their health.

ZRT Laboratory pioneered noninvasive (saliva and dried urine) and semi-invasive (dried blood spots) hormone testing methods, offering a convenient alternative to conventional serum tests. These home collection methods have proven invaluable for research, particularly where conventional testing is prohibitively expensive or logistically challenging. ZRT collaborates with universities, government and military agencies, private physicians, and professional sports teams on hormone research studies.

Dr. Zava remains dedicated to understanding how lifestyle choices, the environment, and genetics impact our hormonal balance and overall well-being. His hands-on approach and commitment to personalized health support permeates ZRT Laboratory, which is renowned for its personalized approach to health.

In addition to his innovations in clinical laboratory testing and numerous scientific publications, Dr. Zava coauthored the landmark book, What Your Doctor May Not Tell You About Breast Cancer: How Hormone Balance Can Help Save Your Life , detailing how hormonal imbalances can contribute to breast cancer and how they can be prevented.

ZRT Laboratory embodies Dr. Zava’s vision, achieving global recognition for delivering clinically relevant precise results, expert insights and excellence in laboratory diagnostics and testing. Dr. Zava continues to inspire and lead efforts to improve health and wellness, making the world a better place through science and education.