Glucose Tolerance Test 2 hour

Aka: Glucose Tolerance Test 2 hour, Two hour Glucose Tolerance Test, OGTT

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II. Indications (rarely indicated)

  1. Diagnosis of Diabetes Mellitus
    1. Replaced by Fasting Serum Glucose >126 mg/dl (and Hemoglobin A1C >6.5%)
    2. May be useful in Insulin Resistance

III. Protocol

  1. Administer 75 grams Glucola drink
  2. Measure Serum Glucose over 2 hour period

IV. Interpretation

  1. Positive if 2 values exceed 200 mg/dl
  2. Elevated values must include 2 hour Glucose

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