Registered Dietitian Exam Prep

Answer: D - Lactose intolerance is diagnosed by a breath hydrogen test, which measures hydrogen produced by the action of intestinal bacteria on lactose, or by the lactose tolerance test, which involves the oral administration of lactose, followed by a blood test measuring blood glucose. A flat blood glucose curve indicates lactose intolerance, due to the body’s inability to break down lactose into glucose and galactose.