I was just wanting to know how accurate gluten free blood tests are?

I have been trialling a gluten free diet for 6 months now and I have decided it is time to get tested?

I get really bad eczema and gas when I eat gluten, I also find that it makes my brain very cloudy and I can not think straight.

Do I need to start eating gluten again to get accurate results about my allergies? Or am I better to stay off gluten? Will this mean my results are less clear because I do not have gluten in my system?

Thank you in advance for your help.