The American National Standards Institute (ANSI) is a private, non-profit organization that administers and coordinates the U.S. voluntary standards and conformity assessment system. Founded in 1918, the Institute works in close collaboration with stakeholders from industry and government to identify and develop standards- and conformance-based solutions to national and global priorities.

Together, standards and technical regulations impact up to 93% of global trade. Globally relevant standards and the conformance measures that assure their effective use help to increase efficiency, open markets, boost consumer confidence, and reduce costs. And ANSI is the U.S. leader in fostering that potential for the benefit of businesses across every industry and consumers around the world.

ANSI is not itself a standards developing organization. Rather, the Institute provides a framework for fair standards development and quality conformity assessment systems and continually works to safeguard their integrity. And as a neutral venue for coordination of standards-based solutions, the Institute brings together private- and public-sector experts and stakeholders to initiate collaborative standardization activities that respond to national priorities. ANSI serves as a strong voice on behalf of the U.S. voluntary standards community, protecting and strengthening its impact domestically and internationally.

Some example ANSI standards include: N42.14-1999 Calibration and Use of Germanium Spectrometers for the Measurement of Gamma-Ray Emission Rates of Radionuclides, N42.23-1996 Measurement and Associated Instrument Quality Assurance for Radioassay Laboratories, N42.12-1994  Calibration and Usage of Thallium-Activated Sodium Iodide Detector Systems for Assay of Radionuclides and many more.

Currently there are 14,035 ANSI standards in 243 technical areas.