I had the test first time, didn't have GD and had a 4.3kg baby.

Didn't have the test second time and had a 4.7kg baby. I don't believe I had GD second time either- lo & behold it's actually possible to just healthily make "big" babies!

From the reading I did I don't hold much faith in the test, nor the idea of GD as a 'condition'.