I have not have this test done I spoke to my gastro dr and she is ordering other tests. I was wondering if Xifaxan worked immediately and you were able to eat regular meals. I was told by my nathuropath this medication is good but the disadvantage of this medication is that the food passes through the digestive system so fast that the nutrients and minerals are not absored in the digestive system. Can you tell me if you were able to gain some the weight back. than you again