I'm a nurse don't need to explain the test to me but there are a lot of false positives.
I declined having the test. The blood sugar levels that determine whether or not you have GD varies between care providers, not to mention that there are a lot of false positives. I was low risk and eating a balanced diet, low in processed foods and high in protein, fresh fruit & veg and wholegrains. When a positive result can mean pressure to have interventions that may or may not be evidence based (insulin, induction, caesarean), I think it's important to be informed with the benefits AND the the risks of testing. All tests and procedures require your consent (actually, informed consent...but my experience is that consent in maternity care is often not especially informed) and you have a right to refuse or decline anything you don't want.