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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.
Fasting blood glucose test. Do not eat or drink anything except water for 8 to 10 hours before a fasting blood glucose test. These are used to diagnose diabetes, a condition caused by too much glucose (sugar) in the blood.ron blood tests are usually taken in the morning before you eat anything. You should also avoid taking iron pills or tablets for 24 hours before your test. Your body absorbs iron very quickly from food or pills, so this can raise your iron levels and affect the test results.