My wife has ra. and her primary dr says it is not necessary to do any testing for vit. d level despite she did it 4years ago was 13. is it not impor ?

Depends: Hi. If she is taking a decent dose of supplemental vitamin D, it's probably not necessary. But it (25(OH)vitD) is a very reliable test and covered by insurance. Why is the doc opposed to checking a lab? That makes no sense, unless she requests many superfluous labs, in which case the doc would be biased by past behavior. I don't know. I love objective data. Good luck to her.

It depends: There is no evidence that I am aware of that correcting a low vitamin D level will improve her RA disease activity or overall outcome. However, many patients with RA have osteopenia or osteoporosis. Correcting a low vitamin D level helps improve bone density and may contribute to lowering her fracture risk. It is also important for her to take adequate calcium supplementation.

It is important: Vit D should be checked and levels should be kept near 60.