Vitamin D3 and High Serum Calcium

At my last Mayo Clinic visit, serum calcium tested at an all-time high, 10.5 mg/dL. The reference range is 8.9 to 10.1 mg/dL, so it’s significantly above normal. Why is that? (1) It could be the myeloma attacking a bone somewhere; or (2) Dr LH noticed that I take a lot of Vitamin D3 and Vitamin K2 supplements, and decided to measure INR and Vitamin D levels. INR was OK.

Vitamin D levels came back the next day, and a couple of days after that Dr LH called to discuss them:

Test Name Result