If you are in the US, you have a right to your medical records. You will have to sign a release and then they have to give them to you. They might fuss that you need to get them from your doc, but in the end they have to give them to you.

I would call the lab and say that you are assembling records to take to a new doc and you need the lab reports. Then ask them to fax or mail you a release form. Even better is if there is an office you can go to in person to get the form filled out and signed. Was this done at a hospital? If so, there is a central medical records office you can go to.