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NVLAP Assessor Bulletins

Assessor Bulletins are issued to communicate guidance relative to assessments, training requirements, and interpretation of accreditation requirements. Examples include procedures for reporting, providing definitions, and clarification of on-site assessment checklist items.

These bulletins may be viewed and printed using Adobe Reader software from Adobe Systems Inc. You may download this software without charge from the Adobe web site. To view a bulletin, click on its title.

Bulletin Number


Bulletin Title

AB-9-2008 ECT On-Site Assessment Report for ECT Laboratories
AB-14-2012 Calibration Updated Assessment Instructions for Calibration Assessors
AB-17-2012  Selected testing LAPs Revision of NVLAP Test Method Review Summary
AB-18-2012  Calibration Gage Block Comparison with Dissimilar Materials
AB-21-2018 All Launch of the nonconformity functionality for assessments in the Assessor Portal
AB-22-2018 All Implementation of ISO/IEC 17025:2017 functionality for assessments in the Assessor Portal
AB-23-2018 All

Policy regarding invoicing with combining multiple assessments

AB-24-2018 All Revision to the application submission information for new and renewal applicant laboratories for accreditation to ISO/IEC 17025:2017 
AB-25-2019 All Updates to the NIST Contract and UTRS Contract processes and forms
AB-27-2019 Calibration Release of NIST Handbook 150-2, 2019 Edition
AB-30-2020 All Implementation of the NVLAP Assessment Plan for assessor use in preparing for assessments and updated Laboratory Assessment Instructions for Assessors
AB-31-2020 All General updates for the release of NIST Handbook 150:2020
AB-35-2022 All Updates to the Laboratory Assessment Instructions for Assessors and the NVLAP Assessment Report forms
AB-38-2023 ECT Policy clarifications and guidance for ECT LAP international travel expenses
AB-39-2024 All Updates to the NIST Contract and UTRS Contract forms



Created February 3, 2010, Updated January 8, 2024