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-   -   Glucose tolerance test (http://forum.lowcarber.org/showthread.php?t=485036)

JeanM Tue, Oct-12-21 07:23

Glucose tolerance test
 
Anyone have info on the best glucose tolerance test to use? I will be paying out of pocket. I see you drink the glucose load and then they test. It gives me 2,4 or 6 specimen options. Thank you for any info!

doreen T Tue, Oct-12-21 18:22

Quote:
Originally Posted by JeanM
Anyone have info on the best glucose tolerance test to use? I will be paying out of pocket. I see you drink the glucose load and then they test. It gives me 2,4 or 6 specimen options. Thank you for any info!

Here's an article at dietdoctor.com explaining blood sugar measurement, including OGTT (oral glucose tolerance test) .. https://www.dietdoctor.com/blood-sugar. Pay particular attention to section #7 :exclm:
Quote:
7. How a low-carb diet affects blood sugar measurements

If you are on a low-carb diet, you may find that some ways of measuring blood sugar will not provide you with “normal” levels.

For example, fasting blood sugar levels may be slightly above normal. This may be due to “adaptive glucose sparing” and “the dawn phenomenon.”

Your fasting blood sugar levels may be elevated because your liver is making extra glucose to prepare your body for the day.

If you are concerned about these levels, ask your healthcare provider to check your HbA1c, which reflects your average blood sugar control over 2-3 months (more on this below).

If you’re on a low-carb diet, your HbA1c will likely be lower than your fasting blood sugar levels would predict, since your blood sugar probably doesn’t increase much after meals.

For people who have been on a low-carb diet for a long time, an OGTT may mistakenly diagnose you as having diabetes. Because your body is fat adapted and no longer using sugar as its main fuel, you may have an exaggerated blood sugar response to the glucose drink. If that occurs, you may fail the test and be given a diabetes diagnosis when you actually do not have the condition.

If your doctor orders an OGTT test and you want to take it, start consuming carbs and sugar about three days before the test.

FWIW, way back in 1992, Dr Atkins also recommended upping carbs to 150g per day for 3 days prior to taking the OGTT. However, he cautioned to avoid high carb - high fat foods such as pizza, burgers, fries, pie or ice cream. Up the carbs, not the fat ;)

Just curious, why are you doing the OGTT? Are you worried about diabetes??

Anyway, hope this has been helpful :daizy:

Doreen

JeanM Wed, Oct-13-21 06:15

Thank you Doreen. I was in the pre- diabetes range a few years ago and both my parents and siblings are type 2. I have not been eating low carb for years but did lose some weight in the last six months. My last 2 HbA1C's were 5 and 5.1. I thought maybe a OGTT might be more reliable? I am striving to get back to a lower carb diet!

GRB5111 Wed, Oct-13-21 09:01

There are a couple good books very useful for those who suspect or have pre- or T2D or T1D:

Diabetes Epidemic & You by Dr. Joseph Kraft. This book goes into great detail about the OGTT and how it must be administered to truly understand one's situation. This is a ground breaking book that is a must read for anyone falling into these categories.

Dr. Bernstein's Diabetes Solution by Dr. Richard Bernstein. Dr. Bernstein is a T1D and has dedicated his life to achieving longevity and quality of life for one with this diagnosis; however, the lifestyle recommendations in this book are sound and useful guidelines for anyone suspicious of a blood glucose or insulin resistance/metabolic syndrome problem.

Kraft's book guides the reader in how to confirm that the type of OGTT is of value in accurately diagnosing the situation. Good luck.

JeanM Sat, Oct-16-21 07:42

Thank you, Rob.


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