"Yet many experts say that even if the tests were accurate, there would still be uncertainty in how to treat patients. There is considerable debate about how much vitamin D is needed and whether vitamin D supplements even prevent various diseases.

....

Meanwhile, the F.D.A. is considering increasing its role in regulating diagnostic tests. Now, test kits sold to labs, hospitals and doctor’s offices must be approved by the agency. But tests developed and offered by a single laboratory, like the Quest vitamin D test, do not."

I strongly believe that people should not go above what is currently recommended by the FDA, no matter what some "trendy" new study shows.

Cherie