You have the right to refuse any medical treatment regardless of whether it is pregnancy related or not. As to whether it will impact on the chances of the birth centre treating you- don't know. A strange rule for sure and abit of a mystery as to why the won't treat GD mothers there

Also- can't help but mention that the fact that just because you are healthy, eat well etc doesn't really mean you won't have GD or that your less likely to have it. The test is for the best interest for your bubs and you and helps assess and monitor your pregnancy if you were to have GD.

Just a thought