how long to fast for blood sample
Most frequent fasting blood test lists: If your doctor asks for a blood test out of this list, please take the lab advice and your doctor recommendations about medications. Fasting blood glucose test requires 8 to 10 hours fasting period before taking the blood sample, only water is allowed, no eating, snacks, caffeine, fruits, or juices. Glucose tolerance test (GTT) test requires 6 hours fasting from foods and drinks before the first sample.