Correct. Anyone can test this if they wish. If you call your physician’s office and ask how much it will cost to have a CBC (the most common blood test, run 20+ times daily at most offices) they will tell you they don’t know. That’s because it depends on your insurance, the specific contract, if the lab is run in the office or sent out, etc. You can then call your insurance and ask the same question, and they will also tell you the same answer - they don’t know. It depends on which physician orders it, what space they are in when it’s ordered (clinic, hospital-based clinic, etc), which lab it goes to, etc. If this is the case for the most common test, imagine what it’s like for much more uncommon tests.