PREGNANCY-BIRTH Messages for August, 2000: Re: 3 hour GTT (glucose tolerance test)for Dr. Montgomery and other medical personnel

Re: 3 hour GTT (glucose tolerance test)for Dr. Montgomery and other medical personnel

From: Ann (anonymous@obgyn.net)
Wed, 30 Aug 2000 18:37:10 -0500 (CDT)

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Reply: Lynn D. Montgomery, MD: "Re: 3 hour GTT (glucose tolerance test)for Dr. Montgomery and other medical personnel"

Thanks Dr. Montgomery and Tonja for your input! I had just happened to read a publication from the NIH re: these tests shortly after I posted that question and it said that water wasn't an issue. (Although the lab techs said NO WATER after the glucola, which I can understand a bit more since I am thinking it "might" lessen the effect of the sugar somehow. Not sure but who knows?) However I do have another question re: these tests: when I took the first test it was a non-fasting 1 hour GTT and that is the one that I failed. The second test I took was the fasting 3 hour GTT. According to my MD after an hour of taking that first test blood sugar above 140 was an indication of possible gestational diabetes. When taking the 3 hr. GTT the first hour blood draw revealed a level of 153, but according to my MD and the NIH this is perfectly acceptable as it would have to be 190 mg/dl or higher to be considered part of a diagnostic criteria (with 120 mg/dl being the normal mean value) I have other women telling me that they took the 1 hour GTT as a fasting test and I am wondering if A) the diagnostic criteria are the same and B) what would the difference be between the cut off of 140 for the 1st take and the higher level of the second test? I am not panicking or anything I am just curious to how the data is assimilated and why patients are instructed differently in the 1 hr. GTT? Thanks for your insight.

At Wed, 30 Aug 2000, Lynn D. Montgomery, MD wrote: >
>At Wed, 30 Aug 2000, Ann wrote:
>>
>>Hi:
>>
>>I posted earlier this week when I found out I had failed my one hour
>>test. I had a question then and I have another one now.
>>
>>Today I took the 3 hour GTT. I drank about 24 oz of water about an hour
>>and a half to an hour and forty-five minutes before beginning the first
>>blood draw. (the fasting blood draw). Could that skew the results in
>>any way? Also, when I went back to take the second blood draw, the
>>phlebotomist was 15 minutes late in taking my blood so instead of it
>>being an hour after the glucola, it was an hour and fifteen minutes.
>>Would that have skewed the data? I went back to take the other two blood
>>draws on time from the original start of test time (time from which I
>>drank the glucola) so I they were uneventful. Neither girl could give
>>me an exact answer re: these two questions although they did both say
>>that you cannot drink water after the test has begun. Please advise. By
>>the way, the test both came back normal.
>>
>>Thanks for your input.
>
>Ann,
>Neither the drinking water or the 15 minute late draw should
>significantly affect the test...
>Lynn
>
>--
>Lynn D. Montgomery, MD
>Director, Maternal-Fetal Medicine
>Rocky Mountain Perinatal Center
>Missoula, Montana
>
>**Note: Opinions expressed here are for educational purposes only and, as such, do not constitute a physician-patient relationship. This information is not intended to supplant the need for you to consult with your physician prior to choosing therapeutic options and/or interventions.
>
>**Private e-mails cannot be entertained due to time constraints, consequently no private e-mails will receive a response.
>
>**Thank you for your understanding ;-)
>

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