Each general chapter is assigned a number that appears in brackets adjacent to the chapter name (e.g., 621 Chromatography
). Articles recognized in these compendia must comply with the official standards and tests and assays in the General Notices, relevant monographs, and General Chapters numbered below 1000. General Chapters numbered above 1000 are considered interpretive and are intended to provide information on, give definition to, or describe a particular subject. They contain no official standards, tests, assays, or other mandatory requirements applicable to any Pharmacopeial article unless specifically referenced in a monograph or elsewhere in the Pharmacopeia.