When is it appropriate to do a glucose tolerance test?

Patient's question:

Now I'm 24 weeks pregnant and it's time for the glucose tolerance test. I've always been unaware of the need for this test. In my circle, I heard it's quite painful, but I believe that every necessary check-up should not be missed because I want a healthy baby. These days, I've been eating quite a lot and haven't paid too much attention to reducing my intake of sweets. Today, I even had some sweet treats and fruits.
What kind of help do I need: When is the appropriate time to do the glucose tolerance test?

Doctor's answer:

Problem Analysis: It involves blood draw. You cannot drink anything after 10 PM the previous night. The next morning, you need to fast and have two tubes of blood drawn. Then, immediately drink glucose solution (it is recommended to get a glucose screening test form from the hospital the day before and after paying, the hospital will give you a package of glucose. On the test day, mix it with 200-300 ml of water at home). After drinking the glucose solution, have another tube of blood drawn one hour later, and then draw the third tube after another hour, which will conclude the process. Before the three blood draws are completed, in addition to drinking glucose solution after the first draw, you cannot drink water or eat breakfast.

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