As Rebecca and Lisa already explained, in a Glucose Challenge Test (GCT) you will be given a glucose drink and your blood glucose level will be checked one hour later. This is a standard test that will be performed in all pregnancies and usually takes place at around 28 weeks gestation (or earlier if risk factors are present). The amount of glucose given in a GCT is exactly 50g, one would expect the blood glucose level to rise somewhat, but not too much. A level over 8 mmol/L will usually see you get invited for a Glucose Tolerance Test (GTT); if the level is over 11 mmol/L you will not need the GTT as this level is in the diabetic range even outside of pregnancy.
A GTT involves following a carbohydrate rich diet for 3 days, your blood will be taken fasting, one hour after the drink and 2 hours after the drink, which will be 75 g glucose in this instance.
Normal fasting blood glucose levels in pregnancy are usually less than 5 mmol/l, we would expect your 1 hour result to be under 10 and the 2 hour result should be < 8 mmol/L. If you have any abnormal result(s) you will be referred to an endocrinologist, diabetes educator or your local hospital diabetes centre, so that you can receive more information about gestational diabetes.
Let us know how you went with your test, so we can guide you through the next phase, if necessary?
Good luck and all the best for the remainder of your pregnancy!
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