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What is the purpose of the Growth Promotion Test?

The purpose of the Growth Promotion Test is to determine the suitability of culture media. The medium is challenged with a small number of microorganisms to assure the nutritive properties. The test is described in USP Chapter <61>: Microbiological Examination of Nonsterile Products: Microbial Enumeration Tests, USP Chapter <62>: Microbiological Examination of Nonsterile Products: Tests for Specified Substances and USP Chapter <71>: Sterility Tests.