Vitamin B1, plasma
Vitamin B1 (thiamine) is an essential nutrient as it plays a vital role in carbohydrate, protein and lipid metabolism. Thiamine deficiency can develop after only one month of a thiamine-free diet. Mild thiamine deficiency occurs in pregnant women (increased requirement), in alcoholics, the elderly, and in malabsorption syndromes. Severe thiamine deficiency is a disorder called beriberi. Fasting is not required for this test. Take all medications as prescribed.
Special Note: Plasma thiamine levels show only recent intake rather than body stores; therefore, whole blood is the preferred specimen for thiamin assessment.