Do You Need to Fast for CBC Blood Test? Centers Urgent Care Glutathione Index Test Food for the Brain Foundation Blood Plasma Quality Control by Plasma Glutathione Status Establishing reference intervals for serum glutathione reductase in healthy adults Fasting requirements for Chemistry tests. 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