43 isn't bad for D3. Depends on the lab, some lab numbers are highish due to the way they're measured. You might want to look into the D3 testing issues at http://vitamindcouncil.org.

It's unfortunate your doctor won't order those tests, however you probably can get them still if you want, you might just have to pay for them out of pocket. There are a number of places you can self-order tests.

Here's what I go by for establishing what was a good level for myself: http://www.grassrootshealth.org/_do...hart_101608.pdf
I tested 60 ng/ml using the ZRT test, which uses the most accurate testing available. I had been on 50,000 iu a week for quite some time.

Here's info about the testing: http://preventdisease.com/news/08/090308_vit_d.shtml Some of the labs use a method that inflates the numbers by 25% or more!