Have you ever wondered why doctors ask you to fast before certain blood tests? Fasting plays an important role in ensuring accurate and reliable test results. When we eat, food can General reaction mechanisms for antioxidant glutathione peroxidase Download Scientific Diagram Fasting for blood work typically involves avoiding food and drink (except water) for eight to twelve hours to ensure accurate results, particularly for tests like glucose, cholesterol, and triglycerides. It is important Fasting Blood Test: How Many Hours Are Required? Centers Urgent Care