I don't need to be a physician to understand that a Gynocologist that pays 1 million a year in malpractice insurance would benefit from paying less then that. They would have lower operating costs and therefore could charge less. You can post all the fake studies you want. It doesn't change economics. I am less concerned about testing costs and more concerned about the insurance costs these businesses have to pay.
Another thing that would drive down the cost of healthcare is a system by which doctors can share tests results with one another. I have observed that doctors in different specialties often order the same tests over and over for the same patients. There should be much more cooperation between PCP's and the specialists that work together when treating an ill patient.