Gastroenterology Book


Lactose Tolerance Test

Aka: Lactose Tolerance Test
  1. See Also
    1. Lactose Intolerance
    2. Lactose Breath Hydrogen Test
  2. Indications
    1. Lactose Intolerance testing
  3. Technique
    1. Obtain baseline Fasting Blood Glucose
    2. Patient ingests 1 to 1.5 grams lactose per kilogram
    3. Measure serial Blood Glucose levels
  4. Interpretation: Positive Test for Lactose Intolerance
    1. Blood Glucose rises <20 mg/dl above Fasting level
    2. Intestinal symptoms of Lactose Intolerance present
  5. Efficacy
    1. False Positive Rate: 20%
    2. False Negative Rate: 20%

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