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Doctor insights on: 2 Hour Glucose Tolerance Test Normal Values

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Confused. got 1 touch machine two weeks ago, readings are frequently as high as 20 mmol, but did glucose tolerance test and it was normal?? what do?

Confused. got 1 touch machine two weeks ago, readings are frequently as high as 20 mmol, but did glucose tolerance test and it was normal?? what do?

Lab test: Glucometer is not used for diagnosis. If you want to know if you have diabetes, ask your doctor to order fasting glucose and an A1c. If bs is over 126 fasting and a1c is over 6.5, then you have diabetes. Good luck. ...Read more

Tolerance (Definition)

When one takes a drug, such as heroin or alcohol, repeatedly, 'tolerance' develops because more of the drug is needed to give the same effect on the body/brain; e.g. Liver enzymes r stimulated to metabolize the drug faster and faster. There may be a strong genetic predisposition to addiction, some studies suggesting that 1 of 10 people will become dependent on alcohol or some ...Read more


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Im 24 weeks preg. I did the glucose tolerance test: 75g of glucose, test after two hours 132mg/dl. Should i worry? What should I do to reduce it?

Im 24 weeks preg. I did the glucose tolerance test: 75g of glucose, test after two hours 132mg/dl. Should i worry? What should I do to reduce it?

Normal: You did a screening test with 75g of glucose. A result under 140 is considered normal. If it was above 140 you would have had a full glucose tolerance test with 100 gm. You do not need to worry. ...Read more

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What are the normal values for serum insulin in glucose tolerance test (75g) after 60 and 120 minutes?

What are the normal values for serum insulin in glucose tolerance test (75g) after 60 and 120 minutes?

Serum insulin: levels are very unreliable and of almost no use in a GTT. The labs don't measure them accurately either. Insulin is supposed to increase during a GTT and will go up more if you are overweight and insulin resistant. There are so-called "normals" but they are inaccurate and worthless. ...Read more

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Fail first glucose tolerance test repeated with a fastied 3hour gluclose tolerance with 100mg oral. 1st hr normal 2nd and 3rd is above normal range?

Fail first glucose tolerance test repeated with a fastied 3hour gluclose tolerance with 100mg oral.  1st hr normal 2nd and 3rd is above normal range?

Need more info: Please note that lab results need to be interpreted in the total clinical context and the doctor who ordered the tests is in the best position to do that. Actual values are needed for evaluation and related circumstances, e.g. Are you pregnant? What is your hb a1c level, do you have symptoms of diabetes? ...Read more

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Non diabetic normal glucose tolerance test A1c between 4.9 to 5.6 but I have dawn phenomenon every morning if i test at 9 hrs fasting why?

Non diabetic normal glucose tolerance test A1c  between 4.9 to 5.6 but I have dawn phenomenon every morning if i test at 9 hrs fasting why?

Unclear question: What do you mean by "dawn phenomenon"? You are obviously under the care of a doctor to have had glucose tolerance test done, please discuss the issue with your doctor who knows the details of your health. ...Read more

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Suffering from pcos but glucose tolerance test 100 mg n fasting sugar tests are normal still can I take metforminam i insulin resistant still ?

Suffering from pcos but glucose tolerance test 100 mg n fasting sugar tests are normal still can I take metforminam i insulin resistant still ?

Yes: Insulin resistance is the basic metabolic cause of pcos, and metformin is generally the best treatment for Insulin resistance and pcos. You want to emphasize diet, exercise and weight loss - plus metformin if indicated- so that you improve your weight and Insulin resistance before your blood sugar gets above normal. ...Read more

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I am prediabetic with higher blood sugar and insulin levels. L just had a 3 hour glucose tolerance test. Fasting sugar is 63, insulin is 2. Meaning?

Doesn't matter: The numbers aren't really important or valuable. If you're overweight and have high glucose (particularly with a positive family history) you need education, diet, exercise, weight reductio and maybe medication -- not just a diagnosis. The diagnosis doesn't help you get healthier. ...Read more

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What's a one hour oral glucose tolerance test?

Screen test: Popular test in obstetrics to identify gestational diabetes : blood sugar is drawn, the patient drinks 75 gm of glucose in the form of glucola and blood sugar is drawn 1 hr after. ...Read more

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Glucose tolerance test: I passed but 1hr-173; 2hr-167; 3hr-103. I walked during last hour. Would walking make me pass when I should have failed?

Glucose tolerance test: I passed but 1hr-173; 2hr-167; 3hr-103. I walked during last hour. Would walking make me pass when I should have failed?

Not likely: Even though you did not follow the protocol, given the other results, you are not likely to have failed the test had you stayed put as required. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. ...Read more

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My oral glucose tolerance test decreased on hours 2 & 3--my doctor mentioned this but did not explain. Why is this significant?

Need the numbers: Hi. We can't tell you anything about your OGTT without knowing the numbers. Give us fasting and 2 hour; that's all we need. ...Read more

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What is a glucose tolerance test?

What is a glucose tolerance test?

A check for diabetes: The GTT is a way for us to see who is at highest risk of diabetes. It is recommended that everyone be screened during their pregnancy, usually around 24-28 weeks. We will give you a bottle of a very sugary drink. You have five minutes to drink it all! Then a hour later we do a blood test to see how you metabolized the sugar. If you are high risk you may need further testing or treatment. ...Read more

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Do I need a glucose tolerance test?

Do I need a glucose tolerance test?

Yes: You actually need a glucose challenge test (gct) in pregnancy, which is a 1 hour screening test for gestational diabetes. If your screening test is abnormal then you need the glucose tolerance test (gtt), which is typically a 3 hour test. It is very important that all women are screened for gestational diabetes in their pregnancies. ...Read more

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How do I do a glucose tolerance test?

How do I do a glucose tolerance test?

GTT at home: Glucose tolerance testing is done less frequently now a days. You can do your own home version geta home glucose testing kit. Do the 1st blood glucose after an overnight fast, have a very hearty breakfast and do a bl glucose 1 hour and 2 hrs after the breakfast. Your fasting bl glucose should be below 200 if above 200 you do not need to do the test, you have diabetes and the result will not cha. ...Read more

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I got a glucose tolerance test, now what?

Screen for diabetes: A normal test can help you feel better that you don't have diabetes. An abnormal test can fall into two buckets - either borderline or frankly diabetic. The cutoffs for "abnormal" are different depending on why you had the test. This is a good thing to speak to the ordering physician about. ...Read more

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What can the do in a glucose tolerance test?

Drink glucose soluti: You drink a glucose solution and then have blood samples taken at various intervals to be analyzed for glucose level. ...Read more

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Can you tell me about glucose tolerance test, now what?

Can you tell me about glucose tolerance test, now what?

Test: Hi. The most standardized test for diabetes, the Oral Glucose Tolerance Test generates data for fasting and a "postprandial" in response to a standard caloric challenge (75 grams of glucose) measured 2 hr after the glucose. Based on criteria for the fasting and 2 hour post-challenge glucoses, you are either normal, diabetic, or the gray zone in between, pre diabetes. Eat healthy diet & exercise! ...Read more

Blood Sugar (Definition)

The blood sugar concentration or blood glucose level is the amount of glucose (sugar) present in the blood of a human or animal. The body naturally tightly regulates blood glucose levels as a part of metabolic homeostasis. Glucose is the primary source of energy for the body's cells, and blood lipids (in the form of fats and oils) are primarily ...Read more


Dr. Cayce Jehaimi
2,588 doctors shared insights

Glucose (Definition)

Glucose is the basic sugar molecule and the source of energy throughout the living kingdom. We are programmed to easily detect it by taste in our foods as it is desirable but can be overdone with the modern diet. It gets out of control ...Read more