INTRODUCTION

Reference Standards provided by the United States Pharmacopeial Convention (USP Reference Standards or USP RS) are highly characterized physical materials or digital data demonstrated to have the appropriate qualities to support their intended use as references for comparison in compendial tests. USP RS are not for use in humans or animals. USP Reference Standards may be presented either as physical materials or as datasets in the form of USP digital Reference Standards (dRS) representing the identity and/or a quantity of a substance.