Impaired Glucose Tolerance (IGT) - PERLA Health

Impaired Glucose Tolerance (IGT)

Impaired Glucose Tolerance is a test to measure if the levels of sugar in your blood are too high. It is measured with a 2 hour oral glucose tolerance test (OGTT). If there are glucose levels measured of 140 to 199 mg/dL, it is considered impaired glucose tolerance, a sign of pre-diabetes.


  1. Rao SS et al. Impaired Glucose Tolerance and Impaired Fasting Glucose. Am Fam Physician. 2004 Apr 15;69(8):1961-1968. (accessed 5. August 2020)
  2. Medscape. What are the WHO diagnostic criteria for impaired glucose tolerance? (accessed 5. August 2020)

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