The typical fasting time before blood work is usually between 8 to 12 hours. This fasting means not eating or drinking anything except water during that period. The exact duration can vary depending on the specific blood test, so it is important to follow the instructions given by the healthcare provider. Common tests that require fasting include those measuring blood sugar, cholesterol, and triglycerides. Drinking water is encouraged during fasting, but avoid smoking, chewing gum, or exercising as these can affect test results. It is often recommended to schedule the blood test in the morning so most of the fasting time happens while sleeping.
