<<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

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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)

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