I started a thread about this a few months ago Basically, ofcorse you can! You aren't required to have any testing you feel uncomfortable with. I refused the GD test based on the fact that I am young, healthy and had a low risk and uncomplicated pregnancy. In the event that I did test positive, in my low-risk situation it would only have been managed with a low GI diet and a bit of watching what I ate, which I was doing anyway. Lots of people are not even offered the GD test if they're young and healthy. For me, being young and healthy, the risk of a false reading wasn't an acceptable risk for me, as I was in a trial homebirth program, and having GD means you can no longer be in it. So I refused, and my midwife was 100% fine with that. In fact, they were fine with me refusing NT testing, GD and GB or whatever it is Weigh up the pros and cons, like if you're low risk and eating well etc. You'll be able to go in and tell someone if things start to change and you get GD symptoms, a good care provider will be checking for warning signs anyway. Hope that helps.