I was eating strict primal before taking my 1 hour glucose test and I failed. Then I took the 3 hour glucose test and failed again. After that, I did some research, and it seems that I should have upped my carbs in the 3 days before the test in order to pass it. I tried telling 2 midwives, 2 nutritionists, and an ultrasound technician about my findings, and although most of them didn't exactly shoot down my theory/findings, none of them had ever heard of such a thing. So, after getting my glucose meter and taking my blood 2 hours after every meal for a few days, I decided to do my own experiment. I upped my carbs a lot...and went totally off primal eating. For the first few days, my blood sugar was high two hours after meals, and then my body started becoming accustomed to all the sugar I was eating. My final test was the morning after my birthday (Dec. 31st). I ate a slice of cake, french fries, and drank soda (gross, I know, but it was the absolute worst breakfast I could think of to end my experiment). 2 hours later, my blood glucose reading was 87, I believe. And this is a very normal level. My fasting glucose is around 75 every morning. I am not a gestational diabetic.
My point is this: A false positive on a blood glucose test can really happen when eating the right way (primal/paleo). If you want to pass the test, just up your carbs in the days before (150+ each day).
I wish I knew all this beforehand so I didn't have the label "gestational diabetic". I live in a major city and I'm really surprised none of the professionals have ever heard of this!
SWt: 212.4 lbs. February 14, 2013 (My second baby was born)
CW: 164.2 lbs.
GW: 145 lbs.
Just keep going.