Is the Lactose intolerance hydrogen test accurate?

The lactose intolerance hydrogen breath test is a widely used and generally accurate method for diagnosing lactose intolerance. It measures the amount of hydrogen in the breath after consuming lactose; elevated levels indicate malabsorption. However, factors such as the individual's gut microbiome and recent dietary habits can affect results, sometimes leading to false positives or negatives. Therefore, while it is a valuable tool, it is often best used in conjunction with other assessments for a comprehensive evaluation.