DAVID JOHNSON, PH.D. is an associate professor and chairman in the department of physiology at the College of Osteopathic Medicine, University of New England, Biddleford, Maine.

Breakthrough medical tests can find dozens of deadly diseases before it's too late. But because of the state of modern healthcare (with insurers' red tape and doctors' busy schedules), most of us don't know that these tests are available let alone which ones to have, what they're called or how to ask them. That's all about to change. With the new book, Medical Tests that can Save Your Life: 21 Tests Your Doctor Won't Order ... Unless You Know To Ask, you'll learn how to determine if you're at risk for life-threatening conditions. Once you gauge your risk levels, Drs. Johnson and Sandmire teach you which test to request from your doctor and how to make sure you get them. Genetic tests for cancer risk, the latest blood tests for heart disease, and even older test like ultrasound have one thing in common: They can save your life.

FIVE LUCKY PEOPLEat the chat will receiveFREE copies of Dr. David Johnson's bookMedical Tests That Can Save Your Life: 21 Tests Your Doctor Won't Order Unless You Know To Ask