A secondary pharmaceutical reference produced and certified in accordance with ISO 17025 and ISO Guide 34. The Certificate of Analysis complies with the requirements of ISO Guide 31 and is traceable to multiple Pharmacopeial Reference Standards. These Certified Reference Materials are traceable to the corresponding United States Pharmacopeia (USP) standards. The standards have also been harmonized and made traceable to both British Pharmacopoeia and European Pharmacopoeia standards. RTC’s Certificates of Analysis for its pharmaceutical reference materials are the most extensive offered in the industry.