I would add, "Don't treat a test result." I have seen that end badly many times.
I wrote yesterday about how Psychiatry is tending towards treating symptoms rather than people. Perhaps it is a general tendency in medicine today to retreat from the personal to the technological. See Treat the Patient, Not the CT Scan.
Medical care is not science. It is applied science - and an art. No checklist of symptoms, blood tests, and CT scans can sum up what is ailing an individual human, whether physically or mentally.
It must be clear by now that the dehumanizing trend in Medicine is something that I deplore. Good docs have to be more than good technicians who follow consensus protocols.
More on that in a letter to the New York Times here.