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Drink Water. Many people believe they should avoid water before a blood draw, but this couldnât be further from the truth. Drinking water will not only make you feel better if youâre fasting, it will also make for a smoother blood draw.
1 2-hour glucose tolerance test (GTT) â for this test, the person has a fasting glucose test done (see above), then drinks a 75-gram glucose drink. 2  Another blood sample is drawn 2 hours after the glucose drink.