This test is no longer available from Labplus. If want to investigate for lactose (or sucrose) malabsorption, assessing disaccharidase activity from small intestinal mucosal biopsies or Hydrogen/methane breath test yield better diagnostic information than oral lactose tolerance test. The American Gastroenterology Association and the British Society of Gastroenterology currently do not advocate the use of this test. There is strong evidence for discarding the lactose tolerance test and replace it with combination of H2/methane breath test , lactase deficiency gene testing or trial of rigorous lactose free diet .