The Oral Glucose Tolerance Test is a blood glucose test that helps doctors in diagnosing prediabetes, type 2 diabetes and gestational diabetes.
This test is generally costlier than the basic fasting blood glucose or post meal blood glucose test.
The person who is going to undergo this test should be fasting for at least 8 hours before the first blood glucose reading is taken.
After that a sweet liquid is given to the person. Typically 75 grams of glucose is mixed with water and needs to be consumed by the person undergoing the test. From then onwards generally blood glucose reading is taken after two hours.
In some cases the readings are taken at the end of one hour and two hours.
If the blood glucose reading at the end of two hours is below 140 mg/dL (7.8 mmol/L) then it is considered to be normal.
If the blood glucose readings range from 140 to 199 mg/dL (7.8-11.05 mmol/L) then the person can be prediabetic.
The blood glucose reading of 200 mg/dL (11.1 mmol/L) or higher can be classified as diabetic.
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Prashanth Reddy Cheruku
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I created this platform with a mission: to educate people worldwide about Food Science, Nutrition & Preventive Healthcare. Our ultimate goal is to enhance both lifespan and healthspan—not just for people, but for PETS too!
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I am a qualified Food Engineer & Sports Nutritionist with over 13 years of research & content creation experience. My academic background includes:
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📍 Indian Institute of Technology (IIT) Kharagpur
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