What is the expiration date of a Reference Standard?
A. The only USP Reference Standards labeled with expiration dates are Certified Reference Materials. Otherwise, USP Reference Standards are not labeled with predetermined expiration dates and are official until otherwise stated in the USP Reference Standard Catalog. The new lot is indicated in the column “Curr. Lot.” The column “Previous Lot/Valid Use Date” indicates the date on which the previous lot will no longer be official. back to top Q.
