I was diagnosed with Gestational Diabetes at 28 weeks. I am now 35 weeks. My doctor tested me after finding sugar in my urine at 27 weeks, though I suspect he would have tested me anyway. I had to first go for a one hour glucose test. At the one hour test I had to drink 8 ounces of a sugary orange soda like drink and then wait one hour. After the hour my blood was drawn and my sugar levels were checked. My reading was very high...in the 200's so I had to go back for a three hour test.

It is actually very common to fail the one hour, but pass the three hour test. Unfortunately that wasn't the case for me. For the three hour I had to have my fasting blood sugar checked and then drink 16 ounces of the same drink. They then checked my sugar every hour for three hours.

Before the three hour test they recommend that you follow a low sugar diet for three days prior and that you not eat 12 hours before the test. You are allowed to drink water...but not in large doses. But, if you are only having the one hour test, my doctor at least didn't say I couldn't eat or drink anything that day.

Good luck!