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How do you test for gluten is it a blood test?
No, what I've done at least here in sweden it's a (excuse the english I've been out fishing and using a computer lexicon to translate) intestinal biopsy with a sample taken from your intestines. The intestiny wall sample can tell if you have celiaki or not.
I've done this three times on my three kids, when determining celiaki or allergy, only one showed traces of celiakic disruptions in the stomach. And that was after a deliberately disruption diet whilst we tried if it was the four seeds or gluten. It was not gluten, He's simply allergic to all four grains. And maize.
It was though a bit scary to do this biopsy since my kids got half sedated and then put on a x-ray bed and a long tube put down their throat with a metal grip on the end designed to cut your intestiny wall... This may sound harsh but it's the only way to for sure determine gluten problems and celiaki, blood samples doesn't have the same accuracy (no accuracy).
The sample from the thin intestiny is then checked in a lab to check the amount / presence of villi intestinales, that detoriates in celiaki due to the gluten.