What is a Glucose Tolerance Test?
A glucose tolerance test is a routine test given to all non-diabetic pregnant women between 24 and 28 weeks of pregnancy. You will be asked to fast for at least 8 hours before the test, so it is recommended to try to do it early in the morning.
Once you arrive, your blood will be drawn to obtain a baseline sample to compare your subsequent results to. After this initial blood draw, you will be given a very sweet, sugary drink that is a syrupy glucose solution.
This is intended to elevate your blood sugar levels to see how your body responds. Ideally, your body will produce the proper amount of insulin that is needed to convert the excess sugar to energy in your blood cells.
After two hours, your blood will be taken again and will be compared to the initial sample to determine your glucose levels. If the sample comes back high, then you may be required to redo the test for a longer interval to get a more accurate measurement. This will determine if you have gestational diabetes or not.