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Doctor insights on: Modified Glucose Tolerance Test

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Dr. David Sneid Dr. Sneid
Internal Medicine - Endocrinology
37 years in practice
Washington University School of Medicine
1

1
What is the difference between oral glucose tolerance test and modified glucose tolerance test?

What is the difference between oral glucose tolerance test and modified glucose tolerance test?

THe modified: Test is simpler and shorter -- and used only in pregnant women, looking to diagnose gestational diabetes, or diabetes in pregnancy.

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


Dr. Megan Bird Dr. Bird
Obstetrics & Gynecology
15 years in practice
2

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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.

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Dr. Amy Herold Dr. Herold
Obstetrics & Gynecology
years in practice
Saint Louis University School of Medicine
3

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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.

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Dr. Luis Gonzalez-mendoza Dr. Gonzalez-mendoza
Pediatrics - Endocrinology
38 years in practice
Autonomous University of Guadalajara Faculty of Medicine
4

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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.

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Dr. Soumya Adhikari Dr. Adhikari
Pediatrics - Endocrinology
16 years in practice
University of Miami Miller School of Medicine
5

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I got a glucose tolerance test, now what?

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.

Dr. David Sneid Dr. Sneid
Internal Medicine - Endocrinology
37 years in practice
Washington University School of Medicine
6

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What can the do in a glucose tolerance test?

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.

Dr. Thomas Knecht Dr. Knecht
Internal Medicine - Endocrinology
27 years in practice
UC San Diego School of Medicine
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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!

Dr. David Geffner Dr. Geffner
Internal Medicine - Endocrinology
50 years in practice
Georgetown University School of Medicine
8
Dr. Ronald Krauser Dr. Krauser
Internal Medicine - Rheumatology
48 years in practice
Wake Forest University School of Medicine
9

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What should I do to make my glucose tolerance test easy tomorrow?

Relax: Just show up, drink the glucola and let them draw your blood. It is not a big deal.

Dr. Ronald Krauser Dr. Krauser
Internal Medicine - Rheumatology
48 years in practice
Wake Forest University School of Medicine
10
Dr. Gurmukh Singh Dr. Singh
Pathology
45 years in practice
University of Pune, Armed Forces Medical College
11

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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?

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?

Dr. Ronald Krauser Dr. Krauser
Internal Medicine - Rheumatology
48 years in practice
Wake Forest University School of Medicine
12

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What is the oral glucose tolerance test?

See details: You drink a glucose preparation (glucola) and your blood glucose is checked before you drink it and at intervals up to 3 or 5 hours after you drink it.

Dr. Luis Gonzalez-mendoza Dr. Gonzalez-mendoza
Pediatrics - Endocrinology
38 years in practice
Autonomous University of Guadalajara Faculty of Medicine
13

13
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.

Dr. Thomas Knecht Dr. Knecht
Internal Medicine - Endocrinology
27 years in practice
UC San Diego School of Medicine
14

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Home ogtt (oral glucose tolerance test), how to do it?

Home ogtt (oral glucose tolerance test), how to do it?

Not an approved test: Hi. You could conceivably weigh out 75 grams of glucose at home and use a finger stick blood glucose meter and do something very similar to a real, diagnostic Standard 2-Hour OGTT, and get a good sense for your glycemic status, but there is no test approved for home diagnosis. Serum glucose should be used (not whole capillary blood). If you want an OGTT, I surest you go get a real one. Good luck!

Dr. Thomas Knecht Dr. Knecht
Internal Medicine - Endocrinology
27 years in practice
UC San Diego School of Medicine
15
Dr. Ronald Krauser Dr. Krauser
Internal Medicine - Rheumatology
48 years in practice
Wake Forest University School of Medicine
16
Dr. Jack Mutnick Dr. Mutnick
Internal Medicine - Allergy & Immunology
13 years in practice
University of Nevada School of Medicine
17
Dr. Luis Gonzalez-mendoza Dr. Gonzalez-mendoza
Pediatrics - Endocrinology
38 years in practice
Autonomous University of Guadalajara Faculty of Medicine
18

18
Can taking glucosamine daily affect the glucose tolerance test?

Not at all: Studies have been done with animals, they were given massive amount of glucosamine and they did not develop glucose intolerance.

Dr. Alan Feldman Dr. Feldman
Internal Medicine - Endocrinology
37 years in practice
Pennsylvania State University College of Medicine
19

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My glucose tolerance test result was 10.8. What should I be doing.

Probably diabetic: A level of 10.8 during the test is just below diagnostic for diabetes. You should do a hba1c, but you have, at the least, impaired glucose tolerance. You should be following a low concentrated sweets diet. If overweight, you need to lose weight. Exercise. You may also need medication based on other lab results.

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Dr. Vered Lewy-Weiss Dr. Lewy-Weiss
Pediatrics - Endocrinology
24 years in practice
New York Medical College
20

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Can you be diagnosed diabetic from glucose tolerance test results?

Can you be diagnosed diabetic from glucose tolerance test results?

Yes: A fasting blood sugar of at least 126 mg/dl or 2-hour post prandial blood sugar of at least 200 mg/dl is diagnostic of diabetes.

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


Modified (Definition)

Potassium is an essential electrolyte, important in the functioning of many organs including the heart, kidneys, muscles, nerves, and digestive system. Deficiency can be caused by diseases such as kidney failure, vomiting, and diarrhea, or by drugs such as diuretics. ...Read more