<<Disclaimer: Verify this information before applying it to your situation.>> Most people said normal IGA and IGG levels were below 20, but different labs use different ranges. The following is from a member of this list and pretty much sums up the Parathyroid Hormone. I hope it helps ------------------------------------------------------------------------------ ------------------------- Hi, "normal" values vary from lab to lab. You should look on your lab report, they will certainly say the normal values. Elevated calcium, as your doctor correctly noticed, may be a sign of elevated parathyroid hormone (PTH). Parathyroid hormone is produced by the parathyroid glands (so named because they are next to the thyroid, there are usually 4 of these glands). The action of PTH is to induce release of calcium from body stores (ie bone) so elevated levels over time can reduce your bone mass and lead to low bone density, something you want to avoid. Calcium levels in the body are ordinarily tightly regulated, with other hormones to counterbalance PTH and ensure a balance between blood calcium and body stores (bone). There are a few other less common situations in which high serum calcium levels may be found, however, if your levels are not particularly high and your PTH also not elevated (those normal ranges are just that, a range, so your normal may be somewhat outside this range) it is not worth worrying over these other possibilities unless other symptoms are present. Hope this is helpful! Selena (medical student, 4th year) * Visit the Celiac Web Page at www.enabling.org/ia/celiac/index.html *