You're at about the right gestation for the GD test... but I am pretty sure mine said "GTT" on it for Glucose Tolerance Test.

Ferratin is something to do with iron...

Does it say anything about fasting before the test? The 2hr GD needs you to fast I think but the 1hr one that I did doesn't need fasting.

If all else fails, call the Obs! Or even your GP should be able to explain!