Seventy-five gram glucose tolerance test to assess carbohydrate malabsorption and small bowel bacterial overgrowth

Figure 1 Changes in breath hydrogen concentration during OGTT in the patient with suspicious of small bowel bacterial overgrowth. An increase of H₂ greater than 10 ppm above the baseline was found at 15 min.

Figure 2 Changes in breath hydrogen concentration during OGTT in the patient with suspicious of carbohydrate malabsorption. Breath H₂ concentration increased gradually from the beginning and reached 10 ppm over the baseline at 70 min and later.

Figure 3 Distribution of time when breath hydrogen and/or methane levels increased more than 10 ppm over baseline.