I went in last week for the 1 hour screening so I don't know yet if I passed or not. The drink kinda tastes like Orange crush. I didn't mind it but it made me burp too! I was curious about the Glucose Tolerance Test in case I don't pass and I found this information:
For eight to 14 hours before the test, you can't eat or drink anything but sips of water (and you're not supposed to smoke or exercise either), so you'll want to schedule it for first thing in the morning.
When you arrive for the test, the technician will take a blood sample to measure your "fasting blood glucose level" and then ask you to drink either a more concentrated dose or a larger volume of the glucose solution. Then brace yourself for three more arm pricks, as your blood is tested every hour for the next three hours. The technician should alternate arms each time she draws your blood.
You'll definitely need something to distract you this time, because you'll have to stay seated in the waiting room between blood drawings. And bring something to eat right after your final blood sample is drawn because you'll probably be starving.
If one of the readings is abnormal, you may have to take another test later in your pregnancy. Or your practitioner may ask you to make some changes in your diet and exercise routine. If two or more of your readings are abnormal, you'll be diagnosed with gestational diabetes and you'll need to talk to your practitioner about a treatment plan.