Sterilization of Health Care Products — Moist Heat — Requirements for the Development, Validation and Routine Control of a Sterilization Process for Medical Devices
First-edition ISO 17665:2024 consolidates and replaces ISO 17665-1:2006 and the two technical specifications (17665-2:2009 and 17665-3:2013) into a single document. It specifies requirements for developing, validating and routinely controlling a moist-heat (saturated steam) sterilization process for medical devices. The standard covers process and product definition, installation, operational and performance qualification, the use of physical measurement together with biological and chemical indicators, and ongoing maintenance of process effectiveness. It sits within the ISO healthcare-sterilization family alongside ISO 11135 (ethylene oxide) and ISO 11137 (radiation), under the general sterility framework of ISO 11139 and ISO 14937.
What this does not cover
stated in the document's own scope- It does not cover ethylene-oxide sterilization — see ISO 11135 for EO processes.
- It does not address radiation sterilization, which is governed by ISO 11137.
- It does not perform biological safety evaluation of materials; biocompatibility is handled under ISO 10993-1.
- It is not a facility cleanroom standard; environmental classification follows ISO 14644-1.
Always verify against the current published text before relying on it for a submission or inspection.
Overview
ISO 17665:2024 is the international standard governing steam (moist-heat) sterilization of medical devices across their development, validation and routine production. It gives manufacturers and healthcare facilities a common basis for proving that a saturated-steam process reliably achieves sterility. The 2024 first edition merges the previous three-part structure — the 2006 requirements standard and the 2009 and 2013 technical specifications — into one coherent document, reducing the interpretation gaps between them. It defines how to characterise the process and product, qualify the equipment, demonstrate lethality, and keep the validated state under control through calibration, requalification and change management.
Legal basis & how it acquires force
ISO 17665 is a voluntary consensus standard, not a law; it acquires force through recognition and reference. It is a recognised consensus standard for FDA premarket submissions demonstrating device sterility, and it supports conformity with the EU Medical Device Regulation (EU) 2017/745 through harmonised-standard status. Within a quality system it is invoked via ISO 13485 process-validation requirements and the general sterility expectations of ISO 11139 and ISO 14937, so compliance becomes contractual and regulatory rather than statutory.
Document structure
| Part | Covers |
|---|---|
| Scope and normative references | Moist-heat sterilization of medical devices; ties to ISO 11139 vocabulary and ISO 14937 general requirements. |
| Process and product definition | Sterilizing agent, load, bioburden and the reference microorganism underpinning the lethality claim. |
| Validation | Installation, operational and performance qualification, including microbiological and physical performance evidence. |
| Routine monitoring and control | Physical parameters, chemical and biological indicators, and load-release criteria. |
| Maintenance of effectiveness | Calibration, requalification, change control and periodic review of the validated process. |
Key requirements
- Define the product and the moist-heat process, including the sterilizing agent, load configuration and the reference microorganism used to establish lethality.
- Qualify equipment through installation qualification (IQ) and operational qualification (OQ), demonstrating the sterilizer performs to specification across its operating range.
- Establish process effectiveness through performance qualification (PQ), combining microbiological (biological indicator) and physical (temperature, pressure, time) evidence.
- Select and apply an appropriate sterilization approach — overkill or a bioburden-based method — with a defined sterility assurance level.
- Monitor each routine cycle using calibrated physical measurement and, where specified, chemical and biological indicators.
- Maintain process effectiveness through requalification, change control and periodic review of calibration and equipment.
- Document the sterilization process definition, validation records and routine-release criteria.
Implementation tips
- Tie the biological-indicator D-value and the product bioburden to your chosen sterility assurance level so the lethality argument is traceable end to end.
- Map the 2024 consolidated clauses back to your legacy 17665-1/-2/-3 documentation so requalification packages reference the current edition.
- Calibrate and challenge temperature sensors at the coldest point of the load established during PQ, and reference that location in routine control.
Where this control fails
live FDA enforcementLive FDA recalls SPEQ maps to this standard’s topics — a SPEQ interpretation, not an FDA classification.
International alignment
ISO 17665:2024 is developed by ISO/TC 198 and sits in the healthcare-sterilization family with ISO 11135 (ethylene oxide) and ISO 11137 (radiation), all under the ISO 11139 vocabulary and ISO 14937 general requirements. FDA recognises the standard for sterility evidence in device submissions, and it carries harmonised-standard weight under the EU MDR. The consolidated 2024 edition aligns terminology across what were previously separate part-1, part-2 and part-3 documents.
ISO 17665:2024: frequently asked questions
Quick answers to common questions about ISO 17665:2024.
Which documents does ISO 17665:2024 replace?
The 2024 first edition cancels and replaces ISO 17665-1:2006, ISO/TS 17665-2:2009 and ISO/TS 17665-3:2013, consolidating them into a single standard.
Does ISO 17665 apply only to industrial sterilization?
No. It applies to moist-heat sterilization of medical devices in both industrial manufacturing and healthcare-facility settings.
What sterility assurance level does moist-heat sterilization target?
A validated process is typically demonstrated to a sterility assurance level of 10^-6 for products labelled sterile, using overkill or bioburden-based approaches.
How does ISO 17665 relate to ISO 11135 and ISO 11137?
They are parallel standards in the same ISO/TC 198 family — 17665 for moist heat, 11135 for ethylene oxide, 11137 for radiation — sharing the ISO 11139 vocabulary.
This standard in practice
Recall domain is a SPEQ mapping of this standard’s topics, not an FDA classification.