Please review this before your next medical test or procedure.
This is a list of tests from various medical associations, informing patients of safety concerns, parameters and cautions for testing and surgical procedures:
http://www.choosingwisely.org/doctor-patient-lists/
Here are all the lists in pdf format:
http://www.choosingwisely.org/wp-content/uploads/2013/02/Choosing-Wisely-Master-List.pdf