This was my experience when I asked Dr. McCormacks office staff about getting the CTX and P1NP…. I commented that I’ll have my Primary physician order it because I was a bit hesitant to ask my endocrinologist for a test that he likely should’ve ordered but chose not to in my initial work up. Her response was , your Primary can’t interpret the results. I made the call to my endo telling him I was securing a consult and that dr wanted those tests. He seemed fine with that and wrote the order. Mind you he was a Fellow , which means he was practicing but still with some oversight. I would’ve been way more hesitant with an older Dr that had been practicing for years. GOOD LUCK!!