White Coat has a post about unnecessary medical testing
He challenges us to find examples of unnecessary medical testing.
Just off the top of my head:
1. Electrolytes unless the patient is in renal failure, on diuretics or steroids, or has been vomiting or has diarrhea.
2. PT/PTT unless the patient is on Coumadin, or you are suspecting liver failure or sepsis.
3. MRI of the back or neck for chronic pain unless there are leg or arm symptoms.