This is a very informative reference. I am a Hospital Corpsman in the U.S. Navy and I see a wide variety of patients on a daily basis. This guide helps me out in performing the correct exams or tests. It also helps the doctor out when he reads my write up. This allows less time for the patient in medical, less time for the doctor, so he doesn't have to see the patient. It also helps me out when a patient is presented to medical with a complaint that I have not heard of or seen yet. I have learned so much more with this book. Thank You and if you are in the medical field and see patients like I do, I recommend this book.