Thanks for your response @lynn59. I saw my endo this morning. I asked to see him instead of the nurse practitioner, because I was concerned about the results of my 24 hour urine test. It was high for calcium. I don't know if he knows much about the bone markers, but he thought they were OK. He wasn't concerned about the high calcium in my urine, saying that my kidneys were working to get rid of the extra. He still wants me on 500 mg calcium a day, but I think I will relax a little about the amount of calcium I'm getting in food. I will see a nephrologist on Saturday for his opinion.