I had an intolerance test some years ago I found was milk onion garlic wasn't a blood test she put samples on my arm. Was advised to drinks lots of water small regular meals to help with the ibs cut out the above so have soya products instead.

Yes, I've taken numerous IgG and IgE food allergy tests. It's called the ELISA Food Tolerance test and it's a simple finger prick for blood sample that goes to the lab. Your doc can order or you can order yourself on line.