@cokie63 There are other reasons for high blood calcium such as hyperparathyroidism. My elderly mom had this and her blood calcium level was high and they removed a parathyroid gland (there are 4) and then tested blood levels again while she was still on the operating table to make sure they got the right one which was confirmed. Here are a few links, one from Mayo, and another form a private practice that explains a lot of causes of high blood calcium. When my mom's levels were high, she had a lot of memory problems which resolved after her surgery. This problem removes calcium from the bones and it goes into the blood. She couldn't take calcium or drink milk at all while this was happening. As soon as she had recovered from this surgery, she fell and broke her pelvis, her ankle and her foot. My thoughts are the bones were thin from this problem causing the break in her foot when she twisted her ankle resulting in the fall and pelvis fracture. She spent 3 months in a rehab center before coming back home. The parathyroids are in the front of the neck near the thyroid gland and an easy path to removal and recovery.
https://www.mayoclinic.org/diseases-conditions/hyperparathyroidism/symptoms-causes/syc-20356194
https://www.parathyroid.com/high-calcium.htm