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Re: 3 hour GTT (glucose tolerance test)for Dr. Montgomery and other medical personnelFrom: Lynn D. Montgomery, MD (anonymous@obgyn.net)Wed, 30 Aug 2000 23:26:09 -0500 (CDT)
At Wed, 30 Aug 2000, Ann wrote: > >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 ;-) >> The one hour test is designed to be a screening tool that does not require the patient to be fasting. This is accomplished by the fact that the test is only one hour and there is a 50 gram glucose load, thus the state of diet isn't really a factor. The three hour test is a 100 gram load, thus the higher 1 hour values. It is designed to be a fasting study, incorporating the fasting blood glucose value as one of its four values... Lynn
-- Lynn D. Montgomery, MD Director, Maternal-Fetal Medicine Rocky Mountain Perinatal Center Missoula, Montana
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