what was the lab's reference range for PTH? I think 7.5 is low.
Good that your doctor is checking out other reasons for high calcium. There are other possibilities other than cancer.
Did they check vitamin D levels yet? They should do.
Oh, just to add. From what i've read, the high calcium that is seen in people with cancer is usually seen with very advanced cancer which would be hard to miss.
Let us know how you go.
I think there are some other medical conditions where high calcium is possible.... look for other explanations too, not just cancer.
I'm not sure about all the levels, but my mom found out she had high calcium last year. This was being caused by a benign tumor on her parathyroid. She had is removed and is fine now. Good luck to you.