<<Disclaimer: Verify this information before applying it to your situation.>> It is true that if gf diet is working, than no, you don't need a test. You are healthy. The value of more definitive tests is for people who are sure they are gf, but still not feeling well. Do they need to track down those last few molecules of gluten, or do they have another problem which is coincidentally somewhat allieviated on a gf diet? I avoided fats and dairy for years becuase those foods gave me the discomfort (funny, though, that the worst trouble came from the ghee in Indian food, which I always ate with tons of bread, and plain yogurt, though disgusting, was less troublesome than bread with yogurt in it) - I was unaware of a problem with gluten per se, since I was never off it. But gluten does seem to be the actual culprit. For others, something about the gf diet may help (maybe their main source of dairy or egg is in baked goods?), but the actual culprit is ? Those folks could use a test that works without the need to encounter whatever is riding along with the gluten. Elizabeth