While Packaging validation is a critical to ensuring that a device will remain sterile and protected until it is ready for use, it is not the last step. It must also be validated that any microbes present on the product after packaging are neutralized. The FDA accepts different standards for sterilization validation, such as Ethylene oxide (EtO), radiation (gamma, E-‐beam, x-‐ray), and steam. The standard that is used depends on the sterilization method chosen for the device. For example, ISO 11737 relates to sample prep and test methods for sterilization validation. For radiation validation (gamma), the FDA uses consensus standard ISO 11137. For EtO validation, the FDA uses consensus standard ISO 11135.