The lactose intolerance test involves giving oral lactose (1.0-1.5g/kg body weight). Lactose intolerance patients develop diarrhoea, abdominal bloating and discomfort within 20 to 30 minutes. Blood glucose is measured 60 minutes before the oral lactose is given and 120 minutes after. As a person with lactose intolerance does not digest lactose, the blood glucose level in such a person does not rise more than 20mg/dL above the baseline.
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