Official Methods of Analysis of AOAC INTERNATIONAL (OMA) is a publication of AOAC INTERNATIONAL comprised of more 3,000 validated methods.

Official Methods of Analysis of AOAC INTERNATIONALSM (OMA) is the most comprehensive and reliable collection of chemical and microbiological methods and consensus standards available. Many Official Methods have been adopted as harmonized international reference methods by the International Organization for Standardization (ISO), International Dairy Federation (IDF), International Union of Pure and Applied Chemistry (IUPAC), and the Codex Alimentarius Commission.

New in the 22nd Edition

  • 35 First Action Methods
  • 30 New SMPRs
  • 2 Revised SMPRs
  • 19 Final Action Methods
  • 1 Modified Method
  • 3 New Appendices

Download the complete list of new methods and changes.

Quick link to Subject and Method Index. Please login at OUP to be directed to the method.

Available Formats

  • Print: A hardcover three-volume set (not a subscription).
  • Online: Via an annual subscription, available through a variety of individual and organizational licenses. Additions and revisions will be posted on a monthly basis.

Subscription Information

Individual customers:

Customers outside the Americas: Subscribe

Customers in North & South America: Email:  [email protected]

Institutional customers:

Customers outside the Americas: Email: [email protected]; Telephone: +44 1865 353705; Online form:

Customers in North & South America: Email: [email protected]; Telephone: 1-800-445-9714; Online form:

General Questions

Please visit our OMA Online 22nd Edition FAQ for the answers to many general questions.

Method Questions

For specific questions about a method, please contact [email protected]