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 Fasting before blood test. Is it necessary for every test?, Many people fast unnecessarily before routine blood tests. Only specific tests like Lipid Profile and Fasting Blood Sugar require 8 to 12 Fasting Blood Test: How Many Hours Are Required? Centers Urgent Care 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 Assay for quantitative determination of glutathione and glutathione disulfide levels using enzymatic recycling method Nature Protocols