ISO 11137

What is ISO 11137?

ISO 11137 is a series of international standards for radiation sterilization of health care products. It separates core process requirements, sterilization dose methods, and dosimetry guidance so manufacturers can build a connected validation and routine-control program.

The series is relevant to medical devices sterilized using radiation technologies such as gamma irradiation, electron beam, or X-ray. It does not replace the standards applicable to ethylene oxide or moist heat processes.

What are the current parts of ISO 11137?

ISO 11137-1:2025 contains requirements for developing, validating, and routinely controlling the sterilization process. This second edition replaced ISO 11137-1:2006.

ISO 11137-2:2013, with Amendment 1:2022, provides methods for establishing and auditing the sterilization dose. ISO 11137-3:2017 provides guidance on dosimetry in process development, validation, and routine control. ISO/TS 11137-4:2020 provides additional guidance on process control for gamma, electron-beam and X-ray irradiation. It is a Technical Specification rather than an International Standard. The parts therefore have different current edition years and should not be cited collectively as “ISO 11137:2025.”

How is the radiation sterilization dose established?

Part 2 provides methods for determining the minimum dose needed to meet a specified sterility requirement and for substantiating certain established doses. It also addresses dose audits used to demonstrate continuing effectiveness.

The chosen method must be appropriate to the product and its bioburden. A dose should not be selected solely because it is common in the industry; the documented method, supporting microbiological data, and continuing audits matter.

What role does dosimetry play?

Dosimetry measures and relates absorbed dose to the product and process. Part 3 supports the dosimetric work used during process definition, qualification, validation, dose mapping, routine monitoring, and change assessment.

Manufacturers should also evaluate whether the maximum acceptable dose affects materials, packaging, function, or biological safety—not only whether the minimum sterilization dose is delivered.

Is ISO 11137 enough for regulatory submission?

It can provide important sterilization evidence, but regulators also expect an integrated dossier covering the product, packaging, microbiological controls, sterilization site, validation, routine records, and applicable material or biocompatibility effects. Requirements differ by jurisdiction.

The evidence may support an EU MDR submission or a submission in the United States as part of a wider medical device market access strategy.