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The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fatand water-soluble vitamins and carotenoids in human serum and plasma. This report describes the design of and results for the Winter, Spring and Fall 1998 MMQAP measurement comparability improvement studies: 1) Round Robin XLII Fat-Soluble Vitamins and Carotenoids in Human Serum, 2) Round Robin XLIII FatSoluble Vitamins and Carotenoids in Human Serum, 3) Round Robin XLIV Fat-Soluble Vitamins and Carotenoids in Human Serum, and 4) Round Robin 11 Ascorbic Acid in Human Serum. The materials for Round Robin XLII were shipped to participants in February 1998; participants were requested to provide their measurement results by April 3, 1998. The materials for Round Robin XLIII were shipped to participants in May 1998; participants were requested to provide their measurement results by June 22, 1998. The materials for Round Robin XLIV were shipped to participants in August 1998; participants were requested to provide their measurement results by October 9, 1998. The sample materials for Round Robin 11 were distributed in September 1998 with results due by October 20, 1998.

NIST micronutrients measurement quality assurance program winter, spring, and fall 1998 comparability studies : results for round robin XLII, XLIII, and XLIV fat-soluble vitamins and carotenoids in human serum and round robin 11 ascorbic acid in human serum