I'm half and half with this, I had to harass the midwives etc... for FOUR weeks to give me a GTT when pregnant with my son because he was huge and I wasn't! He was measuring 40wks at 30wks and they said I was just paranoid! Eventually they did it and I had GD and he was 3 weeks early weighing 9lb 11oz! The GD went away after I had him but low and behold, 2yrs later and it's back and it's autoimmune. I can't stress enough the need to test pregnant women for GD as it is clearly something that could be more than a pregnancy related issue! I've never been overweight and by BMI on diagnosis the 2nd time round was 23 so I agree that they need to give this to everyone!!
However, with regard to the woman who is refusing the test because of the 'stigma' of being obese I don't believe her. If she is that overweight then even just looking at her people would realise she was overweight? She doesn't need a diagnosis for people to see that! A friend of mine has a BMI of over 30 and gave birth to her son not long ago and she was offered the GTT test and she took it and she was fine but before she decided to take it she said to me "I don't want to take it though coz if I have got it then I'm guna have to eat like u do" so in other words the reason she didnt want the test was incase she had to eat healthily and couldn't eat the stuff she loved anymore!!
For people who genuinely feel victimised about their weight obviously that's not a good thing but not everyone is as innocent as they let on and many people know why they're so overweight and simply just do not want to change their diet or take up exercise, it really is as simple as that. My friend freely admits it too!
Diagnosed with GD in 2010, Completely disappeared postpartum. Re-diagnosed December 2012 with type 1.5 diabetes, age 26, BMI 23 currently controlled by only Metformin, 500mg twice a day.