Like PP have said, it's a screening tool, and it's meant to cast a wide net so as not to miss the women who actually have gestational diabetes.
I failed my one hour when pregnant with my daughter. I got a 179 (high!). I had eaten a peanut butter sandwich less than an hour before the test (protein, but plenty of "sugars" in both the bread and the peanut butter). I passed the three hour (which is fasting), and none of my values were out of range.
I just passed my one hour with this pregnancy this past week with no problem.. I ate a breakfast of scrambled eggs and turkey sausage about an hour and a half before drinking the glucola, so no sugar, but plenty of protein.
I can't retake the 1 hr.
Mommy to beauties DS1 (7), DS2 (4, autism), & DS3 (2)
and many angel babies
I just got my results of the 1 hr, I passed with a 64.
I had my normal breakfast of three scrambled eggs and a piece of cheese, then drank the stuff an hour later, then walked to the clinic (ten min walk). I was thinking the walk might have been good to help process the sugar, but it was a normal amount of exersize for me to randomly get.
I failed my 1-hour in both pregnancies, and passed the 3-hour in both. I didn't really modify my diet or do anything particular before the 3-hour. I just continued to eat as I normally do because I figured that if I were diabetic, I would want to know.