NIST Micronutrients Measurement Quality Assurance Program Winter, Spring, and Fall 1991 Comparability Studies: Results for Round Robins XXI, XXII, and XXIII Fat-Soluble Vitamins and Carotenoids in Human Serum

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 1991 MMQAP measurement comparability improvement studies: 1) Round Robin XXI Fat-Soluble Vitamins and Carotenoids in Human Serum, 2) Round Robin XXII FatSoluble Vitamins and Carotenoids in Human Serum, and 3) Round Robin XXIII Fat-Soluble Vitamins and Carotenoids in Human Serum. The materials for Round Robin XXI were shipped to participants in January 1991; participants were requested to provide their measurement results by March 1, 1991. The materials for Round Robin XXII were shipped to participants in May 1991; participants were requested to provide their measurement results by July 9, 1991. The materials for Round Robin XXIII were shipped to participants in August 1991; participants were requested to provide their measurement results by September 13, 1991.