Skip to main content

USP Reference Standards Information

All available USP Reference Standards (RS) can be purchased in the USP iStore. You can sign up to be notified when anew never-before-released Reference Standard becomes available through the Reference Standards Release Notification Program

  • Newly Available USP Reference Standards (updated as of April 28, 2021)
    The following USP RS, which were not available when the associated monograph was made official, have since become available. The respective official date of each USP–NF standard, test, or assay requiring the use of the following USP RS is indicated in parentheses after the name of the RS.
    • No changes to post
  • Unavailable First-Time Official USP Reference Standards (RS) (updated as of April 28, 2021)
    • The official dates of any USP–NF standards, tests, or assays requiring the use of the following new USP RS are postponed until further notice pending availability of the respective RS. Please refer to the current USP Daily Catalog for a more up-to-date availability list.
      • USP Alteplase RS
      • USP Aprotinin RS
      • USP Aprotinin System Suitability RS
      • USP rProtein A, B4 C-Cys RS
      • USP Sargramostim RS