Breath Hydrogen as a Biomarker for Glucose Malabsorption after Roux-en-Y Gastric Bypass Surgery

Figure 2

Representative subject in whom breath levels of hydrogen (closed circles) and methane (open circles) were measured; 25 grams of oral glucose was given after collection of breath at time 0. Note the initial rise in breath hydrogen (early rise), with a second rise in breath hydrogen (late rise) beginning at 80 minutes.