What are some vascular studies that can be done for tingling/burning pain in feet and hands?

I think you: May be better off with Emg/NCV studies.

Abi: Measuring the systolic pressure in the arteries of your feet is a non invasive easy way to check your circulation The ratio of the leg pressure to your arm pressure should be 0.9 -1.3 . if that is the case you are probably experiencing neuropathy. Values under 0.9 indicate vascular disease ratio less than 0.5 may be cause for concern .