Hi. No I have not compared test as I didn’t know about them. I have seen 5 gastroenterologist and 3 allergist/immunologist over 14 years. Can you please tell me if Histamine intolerance and mCAS is the same? Every time I get blood work or 24 hour urine test I am not in a flare up. Shouldn’t the bloodwork or the 24 hour urine test be done when I’m in a huge flareup to get elevated numbers results?