“Doctor, I really want to stay healthy and I just got a big promotion/had a baby/had a grandchild, so I really don’t want to end up with some horrible illness. Please test me for everything.” Primary care doctors hear requests like this all the time. It’s an impossible request to fulfill because it assumes two premises that are usually false. It assumes that we have a test for all illnesses, and that being diagnosed early with a dreaded illness makes a difference. Monday’s NY Times published <...