You drink a gross orange drink that tastes like pure sugar and then they take your blood an hour later. Your doctor will let you know how it went.
You do have to drink a really sweet drink and then wait for an hour. You won't be able to leave the premises so bring something to do. You don't need to fast prior to the test. It's to see how your body metabolizes glucose. If your results fall within 'normal' you should be good to go. If not you'll have to do another glucose tolerance test. For this one you do have to fast (12 hours) and it's usually a 2 hour test. You'll have your fasting blood drawn, drink an even sweeter drink and then you'll get your blood drawn again 2 hours later. Again, you have to remain on premises. It's all to test for gestational diabetes.
I had mine done last Monday , they gave me this drink to take it tasted really bad I was about to throw up but thank god I didn't , then I waited for an hour and they took blood and I got the results the next day and my levels were normal .
Not all get the nasty orange I had the choice between fruit punch Limon lime or orange...I drank the Limon lime not bad tasting at all...drank it under my 5 min...watched tv in the waiting room for an hour you can't eat or drink anything...then they took my blood...I just did it yesterday
Its basically checking for gestational diabetes. If there is something not right, they will bring you back in for a 3 hour test. Then you will just have to change your diet.