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You will be asked to drink a liquid that contains glucose. Your blood will be drawn 1 hour after you drink the glucose solution to check your blood glucose level. 4 Ways To Prepare For A Glucose Screening Test Wikihow The 1 hour test only requires you to give a blood sample and then you can leave soon after. Glucose screening test preparation . There is no prep needed for a random test. On the night before the test the patient should be instructed on Nothing By Mouth NPO after 1000PM. Preparation for a Fasting Plasma Glucose test. For the glucose tolerance test if you are wondering what to eat before the doctor will ask you to consume 150mg of carbohydrate for three days before the test. During the test the mother is asked to drink a sweet liquid glucose and then will have blood drawn one hour from having the drink as blood glucose levels normally peak within one hour. During the first step you will have a glucose screening test. How do I prepare for a glucose tes