Concordance between Lactose Quick Test, hydrogen‐methane breath test and genotyping for the diagnosis of lactose malabsorption in children

Abstract

Genetic test had better concordance with breath test than LQT to diagnose lactose malabsorption, however, none of the patients with normal LQT had lactose malabsorption. In patients who undergo gastroduodenoscopy to study abdominal pain, it seems reasonable to perform LQT, and, in those with hypolactasia, to perform breath test.