Analysis of 25-OH vitamin D2/D3 in physiological fluids, is a frequently used diagnostic test. Thousands of these analyses were performed daily in the world and certified reference materials are used as a chemical indicator for checking the accuracy and the reliability of these measurements. TÜBİTAK UME " aims to complete lyophilized serum 25-OH vitamin D2/D3-UME CRM 1308" certified reference material and recently started its production. Certification studies is going to done with the participation of many laboratory studies.
(In progress)