Hi, has anyone here done this test before? I did it today but we had some problems. Baseline were 0 ppm, then I drank a glucose drink. After 20 minutes I had 49 ppm. After 40 minutes I measured again but had 0 ppm. After 60 minutes I wanted to test again but the device was broken. The touchscreen didn't work anymore although we tried multiple times to restart it. The doctors' assistant then told me that the device was repaired only one week before because of the same reason. Now my questions are. Are 49 ppm a positive indicator of SIBO? I heard that even 12 ppm make SIBO likely and 20 ppm prove SIBO. I wondered why the 40 min value was 0. The causes could be a) the device was already broken and didn't measure correctly b) the glucose was already absorbed c) I don't have SIBO I heard that glucose gets absorbed very fast and within 60 minutes most tests return to 0 ppm because the glucose is fully gone. Does anyone have experience with glucose breath test results? I have a new appointment for tomorrow, this time they want to take my blood after drinking the glucose. Is this useful?