I have been following my calcium levels for the last few years, and they seem to fluctuate a lot. I read that this could indicate parathyroid disease. My calcium levels over the last four years were as follows: 9.7, 9.2, 9.1, 9.8, 9.9, 9.1. Do you think I have parathyroid disease? I'm a 52 year old man.
As long as your calcium levels are staying in the normal range (which they are), then some fluctuation is normal. In general, your parathyroid glands do try to maintain a relatively steady calcium level, but this does not mean that the level will be exactly the same every time it is checked. Your labs appear completely normal.
My answer would change if you had calcium levels fluctuating into the high range. For example, if several of your calcium levels were above 10.0 mg/dl (2.5 mmol/l), this would indicate possible parathyroid disease, and I would want to confirm with PTH levels. But with calcium levels all in the 9s, parathyroid disease is very unlikely.