NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
NIST/NIH Vitamin D Metabolites Quality Assurance Program (VitDQAP): Final Report
Published
Author(s)
Katrice A. Lippa, Mary Bedner, Susan Tai, Carolyn Q. Burdette
Abstract
The National Institute of Standards and Technology (NIST) established a Vitamin D Metabolites Quality Assurance Program (VitDQAP) in collaboration with the National Institutes of Health Office of Dietary Supplements (NIH-ODS) in 2009. The VitDQAP at NIST administered twelve interlaboratory comparison exercises through 2016 for the measurement of vitamin D metabolites in human serum and plasma. The comparability of participant measurements for target analytes improved substantially over time through the development and promulgation of robust measurement technologies, identification and production of suitable reference materials, isolation and identification of measurement system biases, and support and encouragement of within-laboratory measurement quality control efforts. This VitDQAP Final Report summarizes the program and provides highlights of the twelve exercises conducted during the programs eight-year lifetime.
Lippa, K.
, Bedner, M.
, Tai, S.
and Burdette, C.
(2020),
NIST/NIH Vitamin D Metabolites Quality Assurance Program (VitDQAP): Final Report, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.8293
(Accessed October 10, 2025)