saying thank you doesn't even begin to convey my feelings mrsd

Just watching her trying to cope is what put me into high gear and this information is sooo very helpful. Calming too!

Vit D, 25-OH, Total 30 20-100 ng/mL

Vit D, 25-OH, D3 30 ng/mL

Vit D, 25-OH, D2 <4

He has her taking 3000 to 4000 IU of Vit D3 daily.

The zinc issue, I will her bring this up to her doctor.

Is there one definitive blood test that could be run to find as many crucial deficiencies as possible, in people with problems such as food allergies, gluten intolerance, etc? It seems he takes one series of tests, finds something than orders more. Why not nip it in the bud, so to speak?
Since vitamin and mineral deficiencies tend to be the norm why not run as many all at once?

Which vitamin/minerals should be checked right out the gate?