You must make sure, before you get answers from parents, that you are doing like Diane said, make sure you have the same unit of measure. We always have it done in ng/Dl (nanograms per decilitre). Remember, "normal" is a big range, too. Yes, it depends on age of the child if you're talking baby versus 10-yr-old....but, again, it's not a huge difference. Also, remember that our kids have a disorder and might not reach the "normal" levels....we may shoot for it....but we gotta have an "acceptable" level instead of insisting on "normal".