Since the beginning, ZRT has maintained a singular focus: helping people get and stay healthy. With 20 years of experience an ... d results from over 8 million tests, ZRT Laboratory is a recognized leader in innovative and meaningful hormone, neurotransmitter and elements testing. Individuals, health care providers in all 50 states and 90 countries, and research teams worldwide use our tests, including the CDC, the NIH and many renowned universities. ZRT is the recognized leader in saliva and dried blood spot testing for hormones, and holds the distinction of being the lab that developed dried urine testing for hormones. ZRT was founded and is led by David Zava, PhD, a renown expert in hormones and breast cancer. He is an author, researcher and frequent lecturer at industry events. Learn more about the role of hormones, neurotransmitters and elements in our health at https://www.zrtlab.com/blog/. read more