Any doc worth his/her salt would order standard chemistry tests that include calcium just to have a baseline after getting a chief complaint as well as complete prior medical and surgical history. Parathyroid levels would be checked only if the calcium result is abnormal, possibly only if that calcium result is confirmed by a repeat test.
Calcium could vary from normal to high normal, to above normal. I’ve been borderline above normal for years and I’m only 27.
I didn’t say what I wanted to. Calcium doesn’t have to be above normal to have parathyroid disease.