Yep there are two different tests, usually you do the non-fasting one first and if the results indicate they'll make you do the second one.

I loved the drink, but for some reason my blood pressure dropped heaps and I wound up in a hospital bed drinking litres of water until it got high enough for them to let me go home... I had a midwife appt after the tests & the pathology girls phoned the midwives to come & get me because I was so dizzy...