Skip to main content
U.S. flag

An official website of the United States government

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.

National Voluntary Laboratory Accreditation Program (NVLAP) Calibration Laboratories



Barbara J. Belzer, Kari K. Harper, Titilayo O. Shodiya


NIST Handbook 150-2, 2019 edition, presents the technical requirements and guidance for the accreditation of laboratories under the National Voluntary Laboratory Accreditation Program (NVLAP) Calibration Laboratories Program. The 2019 edition of NIST Handbook 150-2 supersedes and replaces the 2016 version of NIST Handbook 150-2. The 2019 edition has been updated to reflect the requirements of ISO/IEC 17025:2017 and has added new normative annexes covering specific technical areas. These annexes set out technical requirements not covered in NIST Handbook 150 that are applicable to a laboratory recognized as competent to carry out calibrations in the specific technical areas covered. The annexes form a normative part of this handbook, meaning they contain provisions that laboratories must meet in order to conform to the requirements for accreditation. Calibration laboratories use NIST Handbook 150-2 in developing the management and technical systems that govern their operations. Laboratory customers, regulatory authorities, and accreditation bodies may also use it as a basis upon which to judge the competence of laboratories.
Handbook (NIST HB) - 150-2-2019
Report Number


accreditation, assessment, calibration, ISO/IEC 17025, laboratory, management system, NVLAP, proficiency testing, quality


Belzer, B. , Harper, K. and Shodiya, T. (2019), National Voluntary Laboratory Accreditation Program (NVLAP) Calibration Laboratories, Handbook (NIST HB), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed May 22, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created July 28, 2019, Updated October 12, 2021