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###### Department of Health and Human Services

###### National Institutes of Health

# SUMMARY:

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].

# DATES:

The expected start date for the study is June 2015.

# ADDRESSES:

                        For more information about the study and to let us know if you are interested in participating, please contact us at:                         *vdsp@mail.nih.gov.*

# FOR FURTHER INFORMATION CONTACT:

                        Drs. Johanna Camara, NIST, and Christopher Sempos, ODS, Director and Co-Director, respectively, for the VDSP Commutability Study 2. Email:                         *VDSP@mail.nih.gov.*

# SUPPLEMENTARY INFORMATION:

                    The objective of the study is to promote the standardized measurement of total 25(OH)D by evaluating the commutability of NIST Standard Reference Materials® (SRM) used as “trueness” controls and the materials used in the major Performance Testing/External Quality (PT/EQA) programs administered by CAP and DEQAS.                     *Who Can Participate:*                     (1) All commercial manufacturers of 25(OH)D assays (requests from manufacturers with assays in development will be considered); (2) Clinical and research laboratories using a commercial assay platform; (3) Laboratories for national/subnational nutrition surveys; and (4) Laboratories using in-house developed assays.                

                    For details about the study design and time lines, see the recently published paper in the February 2015 edition of Clinical Laboratory News, (                    *https://www.aacc.org/​publications/​cln/​articles/​2015/​february/​vitamin-d-commutability-study*).                

Dated: March 24, 2015.

Lawrence A. Tabak,

Deputy Director, National Institutes of Health.

[FR Doc. 2015-07326 Filed 3-31-15; 8:45 am]

 BILLING CODE 4140-01-P