The Vitamin E (Tocopherol) test measures the level of your body's primary, fat-soluble antioxidant. Vitamin E is essential for protecting your cells from damage (oxidative stress), supporting immune function, and maintaining nerve and skin health. A deficiency is rare but can be serious, and is often linked to conditions that affect fat absorption. This simple blood test provides a clear look at your body's 'master antioxidant' level, ensuring your cells have the protection they need.