I never make any assumptions because as I was once told “ to assume just makes an a— out of u and me”! Pardon my implied language! Always ask questions of the prescribing doctor about tests, treatments, medications, diagnoses ….. until you understand and are satisfied with the answers. Make sure you are asking your questions of the appropriate provider not a nurse, technician, receptionist, scheduler ….. etc. because they are just doing their job to follow the doctor’s orders and don’t have much authority in the situation.