ISO 10993-18 defines standards for identifying biological hazards and risks in the chemical makeup of medical devices. Through chemical characterization and biological evaluation of medical devices, manufacturers must, in order to meet FDA compliance, test and evaluate for the potential of extractables and leachables to adversely affect the health of end users. ISO 10993 Part 18 provides a testing and identification framework to do so.
Extractables and leachables are chemical elements or components that may be transferred from medical devices into the materials with which patients, handlers, end users, and others may interact. This transfer may occur through normal usage (such as storage of medicine within a medical device like a syringe or test tube), or through exposure to extreme elements such as heat, UV, or cold.