Office of Dietary Supplements VDSP Commutability Study 2

NIH Office of Dietary Supplements (ODS) and the National Institute of Standards and Technology (NIST), in collaboration with the College of American Pathologists (CAP) and Vitamin D External Quality Assessment Scheme (DEQAS), announce that as part of the Vitamin D Standardization Program (VDSP), they are recruiting laboratories to participate in a study of the commutability of pooled serum samples used in assays to measure total 25-hydroxyvitamin D [25(OH)D].