Why do doctors require you to go to certain places for testing?

Question:

I recently had to have labs, renal ultrasound, bone density and a baseline mammogram for a new doctor. I chose to have all of them done at the hospital where I work. I was there for less then three hours. I received a not so nice phone call today that the doctor doesn't like his patients to go to the hospital because it is more expensive.
The nurse said that he wants his pt's to go to X place for labs and then another place for the Ultrasound and yet another place for the mammogram.
Do physicians get a kick back from testing centers also? Why should it matter to him that it costs more? Can he refuse to treat me if I continue to go where I want to?

Answers:
I do IT work for many doctors offices. What I've noticed is that many doctors have relationships with Radiologist (or people that read X-Rays). There are good and bad ones. And some radiologists offer the results to the doctor in a specific format (IE: reports, digital reports, charts, etc) and your physician just likes working with them. It should ultimately be your choice.

I have known doctors that have their own lab/xray equipment require a new x-ray be done in their lab for some reason or another and I DO believ this is a scam. Why can't they just view the x-ray that was taken 2 days ago? because they want to bill the insurance company for an x-ray in their facility.

I haven't noticed any monitary relationships between the docs and xray facilities. BUT.. I have seen relationships between Insurance companies and X-Ray facilities... Where your insurance company might force you to use a certain imaging center...

When I was pregnant, I wanted my sonogram done at the hospital and the doctor screamed at me "DON'T YOU DICTATE MEDICINE TO ME". I could not believe how he overreacted. I asked him why and he said he liked the way this particular doctor did the sonogram and wanted me to go to him. I think they get kickbacks. It should be his recommendation but my ultimate choice. The doctor he wanted had a long wait for an appointment and the hospital did not have a long wait and I needed to see something on the BABY ASAP. Another doc I had just for myself used to recommend me to people who could do him favors... oh yeah, it's a racket. We are the pawns. Didn't you know that?

Why do doctors require you to go to certain places for testing?

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