Figure 2From: Significance of hydrogen breath tests in children with suspected carbohydrate malabsorption Time course analysis of hydrogen concentrations during breath tests. Comparison of the rise in breath hydrogen over time after ingestion of test meal in patients with positive and negative results of hydrogen breath tests with lactose (A), fructose (B), and sorbitol (C). Tracing of breath hydrogen excretion is expressed as mean ± SEM.Back to article page