1.1 ,This guide outlines best practices to consider when setting up a representative leachable test method to detect if a material is compatible with cell culture media or manufacturing processes. This guide does not replace or supersede cell growth tests like USP <,87>,, USP <,88>, (plastic/elastomeric materials), or ISO 10993 (medical device materials), that are used in assessing biological reactivity in humans. Polymeric materials that have passed these tests have been found to leach compounds under normal process conditions that can inhibit cell culture growth for some cell lines. See Refs (1-5).2 Test methods that are representative of the manufacturing conditions will help identify materials that are appropriate for use during manufacturing.