As a general rule, patients should avoid eating or drinking anything other than water during the 12 hours prior to any blood test. Blood tests specifically prohibiting alcohol consumption in the 24 hours prior to the adm... More »

Blood glucose tests and cholesterol tests require patients to avoid eating or drinking anything except water for 8 hours before the test, unless directed otherwise by a doctor, as stated by Geisinger Medical Laboratories... More »

Fasting for a certain length of time before a blood test is one way of ensuring that your test results are not contaminated by the food you've eaten. The Mayo Clinic notes that fasting may not be necessary to get an accu... More »

Blood glucose tests and cholesterol tests require patients to avoid eating or drinking anything except water for 8 hours before the test, unless directed otherwise by a doctor, as stated by Geisinger Medical Laboratories... More »

One typically doesn't need to do anything in preparation for an alkaline phosphatase blood test since it's usually performed during a routine blood test, states WebMD. However, if the initial test results are inconclusiv... More »

www.reference.com Health Diagnostics & Imaging

Tissue transglutaminase antibodies, or tTG-IgA, blood test results produce a positive result in 98 percent of patients who do have celiac disease, and a negative result in 95 percent of patients who do not have celiac di... More »

When fasting before a blood test, an individual is allowed to consume water and take usual medications unless instructed otherwise by the health care provider ordering the test. No other food or beverages should be consu... More »