We are entering a period of greater involvement by individuals in their own health care. People want to know more about medicine, so that they can make intelligent choices among the many options that are available to them. Here is a book to help individuals learn more about medical tests— blood and urine tests, tests for infection, tests for heart disease, tests for women, tests for men, x-rays, nuclear scans, ultrasound, scoping procedures, biopsies and taps, miscellaneous tests, and home tests.<i>The People's Book of Medical Tests</i>covers several hundred different tests. A nice feature of this book is information on the cost of each test, which is given as a range. The table on the composition of urinary reagent strip tests and their relative costs is one of the best I have seen. The discussion of home or self tests is particularly good. Most physicians, as well as laypersons,