Our Medical Department

Diagnos-Techs' team of medical advisors are available via telephone to assist our licensed health care professional clients. They can answer questions about our laboratory tests and provide assistance with interpretation of test results. Call 800-878-3787 to schedule an appointment.

Diagnos-Techs' medical support team provides more than 100 years of combined experience, embracing multiple disciplines, and is available to all clients utilizing the company's testing services. Distinguished physicians and surgeons from the finest medical schools of the United States, Canada and Egypt, work in harmony with seasoned naturopathic doctors.

Our doctors are happy to assist any client of Diagnos-Techs to insure the most valuable experience and effective result for the party of ultimate interest, the patient.

Medical Support

About Our Doctors


Lisa Canar, ND
Medical Department Coordinator

Dr. Canar received her Doctorate of Naturopathic Medicine from Bastyr University in 2001. Following medical school, Dr. Canar practiced family medicine for three years before completing post-doctoral research training with the cancer prevention research group at the University of Michigan Comprehensive Cancer Center, where she participated in a variety of prevention studies involving dietary pattern changes, dietary supplementation, counseling, and lifestyle modification. More recently, Dr. Canar has served as an independent research physician and clinical research consultant, focusing on clinical research initiatives in health promotion, chronic disease prevention, and healthy aging.


Eric Semsak, ND

Dr. Semsak received his Doctorate of Naturopathic Medicine from Bastyr University and is currently a licensed naturopathic physician in the state of Washington. Emphasizing clinical medicine, Dr. Semsak has practiced primary care family medicine for over six years. He currently maintains a small private practice specializing in metabolic pathways, fatigue, hormone balancing, and gastrointestinal health.


Rich Petke, ND

Dr. Petke received his Doctorate of Naturopathic Medicine from Southwest College of Naturopathic Medicine in 2010. He practiced family medicine in Flagstaff, AZ, for 6 years and served part-time as a staff physician in a developmental and behavioral pediatrics specialty practice in Phoenix for 5 years. In addition to traditional developmental and behavioral conditions such as autism, developmental delay, ADHD, genetic abnormalities, communication disorders, and intellectual impairment, Dr. Petke specialized in learning challenges including dyslexia, Irlen syndrome, and the dynamics of giftedness.