Did your doctor administer a lactose intolerance test, or diagnose you based on diet?
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What other tests can detect lactose intolerance?
Many clinicians simply make this diagnosis based on improvement of symptoms
when lactose is withheld from the patient's diet and affravation when it is
re-introduced. Other tests used to detect lactose intolerance include the lactose hydrogen breath test and stool acidity test, the latter is primarily used in infants and very young children. There also is a genetic test which can determine whether an individual has or does not have the intestinal enzyme that is required for the digestion and absorption of lactose.