Figure 2.

Diagnostic algorithm for diagnosing lactose malabsorption and lactose intolerance

Diagnosis of lactose malabsorption is a pre-requisite for diagnosis of lactose intolerance (LI). Tests of malabsorption (genetic, biopsy) should be followed by a test of intolerance before lactose restriction is recommended. Blinded testing at multiple doses in the home setting may help guide rational dietary management; however, protocols still need to be established. LI, lactose intolerance; IBS, irritable bowel syndrome; SIBO, small intestinal bacterial overgrowth.