[The oral vitamin E tolerance test--an attempt at standardization]

Area of Science:

• Clinical Biochemistry
• Nutritional Science
• Neurology

Context:

• Chronic vitamin E deficiency leads to neurological impairments like ataxia and muscle weakness.
• Malabsorption, either fat-related or isolated, is a common cause of vitamin E deficiency.
• Current diagnostic methods lack standardized parameters for vitamin E reabsorption tests.

Purpose:

• To establish standardized normal parameters for the oral vitamin E tolerance test.
• To evaluate the ratio of serum vitamin E to cholesterol and triglycerides for diagnosing vitamin E deficiency.
• To investigate the correlation between serum vitamin E and lipid levels over time.

Summary:

• 61 healthy individuals received 100 IU of vitamin E orally with milk.
• Serum vitamin E, cholesterol, and triglycerides were measured for 72 hours using high-performance liquid chromatography.
• The ratio of vitamin E to the sum of cholesterol and triglycerides was calculated, establishing 90% confidence intervals at various time points.

Impact:

• The study provides crucial reference ranges for the vitamin E/lipid ratio, aiding in accurate diagnosis.
• This ratio is more reliable than serum vitamin E alone, especially in cases of high lipid concentrations.
• Improved diagnosis of vitamin E deficiency can lead to timely intervention and prevention of neurological damage.