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The Question
Sat Jul 20 15:50:24 UTC 2013

Is it possible the OGTT was wrong and gave a false negative?
Asked By: bkek  

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I was diagnosed with GD at 23 weeks. I controlled the GD with diet/exercise (no medication) and delivered a healthy baby 6 weeks ago with no complications. I also have a history of PCOS. At my postpartum appointment, an OGTT was done. The lab results were a fasting of 65, a 1 hr of 112, and a 2 hr of 116. My finger samples showed results of 85, 156, and 134. At 3 hrs, I had a reading of 54 on my meter. I know there are differences between venous and capillary samples but the difference seems excessive. I verified my testing as best I can (clean hands, good strips, etc.). I checked my meter against 2 others and they were within 10 mg/dl. I have tested myself at home since delivery and have gotten some 2 hr numbers in the 130-150 range. I eat a reduced carb diet but have increased my carbs (to 80 g) to keep up my milk supply. I am wondering if there could be a cause for the difference? My family thinks I'm concerned about nothing and doesn't think it's worth contacting my doctor.
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Expert Answers (1)
2014-04-23 01:59:10.0

Dear bkek::

Well, as "they" say, "Anything is possible", but are you worrying needlessly at this time?

An OGTT (Oral Glucose Tolerance Test) is considered an accurate means of diagnosing diabetes, or, in your case, Gestational Diabetes.

Based on your description, it sounds like the variance in your meter is as likely to be the cause of your elevated numbers as anything. Also, 80 grams of CHO is a pretty heavy load, even for a nursing mother. Generally 45-60 grams per meal is considered to be sufficient while nursing. You might try adding in extra protein and cutting back on the carbohydrate (CHO) a bit.

If you haven't spoken to an RD, CDE (Registered Dietitian, Certified Diabetes Educator), I would suggest that. As far as asking your doctor his or her opinion, it is always good to follow your instinct and ask questions when you are in doubt. Do not feel silly if you wish to speak to your doctor about this matter.

Good luck, congratulations on a successful pregnancy, and happy lactating!!

Answered By: Anne Carroll
Accreditations: RN, CDE
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*** All information contained on dLife.com is intended for informational and educational purposes only. Our Expert Q&A is not intended to be a replacement or substitute for consultation with a qualified medical professional or for professional medical advice related to diabetes or another medical condition. Please contact your physician or medical professional with any questions and concerns about your medical condition.

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