ISO 22441 Beyond the U.S.: How VHP Sterilization Now Navigates EU MDR, Health Canada, TGA, and PMDA

For the first decade of its commercial existence, vaporized hydrogen peroxide sterilization operated with an implicit jurisdictional ceiling. The United States was the primary adoption market. The validation frameworks were primarily U.S.-sourced. The regulatory conversations were predominantly FDA-centric. Manufacturers with global device portfolios who adopted VHP often did so knowing they would need to construct parallel sterilization arguments for each additional market.

That structure has changed. ISO 22441:2022 — the international standard governing the development and validation of VHP sterilization processes for medical devices — is now formally recognized across the regulatory jurisdictions that collectively cover the majority of global medical device commerce. A VHP validation package built to ISO 22441 specifications is no longer primarily a U.S. document. It is a globally portable regulatory asset.

What ISO 22441:2022 Actually Is

ISO 22441:2022 is the international standard that governs the design, development, validation, and routine control of VHP sterilization processes for medical devices. It was developed under ISO Technical Committee 198 (Sterilization of Health Care Products) and published in 2022 as the first dedicated international standard for VHP sterilization — replacing the informal reliance on ISO 14937 (general sterilization principles) and various national or proprietary frameworks that preceded it.

The standard is structured around the same validation lifecycle framework that governs the other established sterilization methods: process development and optimization, installation qualification (IQ), operational qualification (OQ), performance qualification (PQ) using biological indicators, routine process monitoring, and periodic requalification. The biological indicator organism specified is Geobacillus stearothermophilus — the same organism used for steam sterilization validation — with calibrated D-values specific to VHP exposure conditions. The sterilization assurance level (SAL) target is 10⁻⁶, the same standard applied across all terminal sterilization methods.

For validation teams fluent in ISO 11135 (EtO), ISO 11137 (radiation), or ISO 17665 (steam), the ISO 22441 framework is immediately recognizable in structure. The method-specific parameters differ — VHP concentration, temperature, humidity, dwell time — but the validation logic, documentation architecture, and regulatory submission format are directly analogous.

ISO 22441 is currently at lifecycle stage 90.20, indicating it is under systematic review — the standard review cycle that ISO conducts every five years. Stage 90.20 is not a withdrawal indicator; it is a quality-control marker confirming the standard remains active while its technical committee evaluates whether amendments are warranted. The standard is in active international use.

FDA Recognition: The Foundation

In May 2023, FDA recognized ISO 22441:2022 as a consensus standard for use in premarket submissions. In January 2024, FDA formally reclassified VHP to Established Category A — placing it alongside steam, EtO, dry heat, and irradiation as a recognized sterilization method with an established scientific evidence base. The combination of consensus standard recognition and Category A designation resolved the primary regulatory uncertainty that had limited VHP's adoption in U.S. submissions.

For the purposes of international regulatory acceptance, FDA's Category A designation matters primarily as a signal of U.S. regulatory maturity — evidence that the method and standard have been evaluated by the world's most resource-intensive medical device regulatory authority and found scientifically sufficient. Other regulatory authorities that reference FDA positions as an element of their own technical assessments interpret Category A designation accordingly.

The more direct mechanism for international acceptance is ISO 22441's status as an internationally published standard under an organization that holds formal liaison relationships with regulatory authorities across the jurisdictions examined below.

European Union: EU MDR and Notified Body Practice

The EU Medical Device Regulation (EU MDR 2017/745) requires that medical devices sterilized by terminal sterilization methods meet the requirements of harmonized European standards where they exist. For EtO, the harmonized standard is EN ISO 11135. For radiation, EN ISO 11137. For steam, EN ISO 17665.

ISO 22441 is not yet formally listed as a harmonized standard under the EU MDR — that process requires formal citation in the Official Journal of the European Union following a European Commission designation. However, harmonized status is not required for an ISO standard to be used in EU conformity assessment. Under EU MDR Article 61 and Annex IX, Notified Bodies assess sterilization processes against applicable standards, and ISO 22441 is widely recognized by Notified Bodies as the applicable international standard for VHP. SGS, one of the largest EU-authorized Notified Bodies for medical devices, formally includes ISO 22441 in its VHP process certification services. Regulatory intelligence published by Regulatory Rapporteur (December 2024) documents that EU Notified Bodies are actively accepting ISO 22441-aligned technical documentation in CE-marking reviews, with the expectation that formal harmonization — via Official Journal citation — is forthcoming as the standard's use in submissions accumulates.

The practical implication: manufacturers preparing technical documentation for CE-marked devices sterilized by VHP should reference ISO 22441:2022 as the applicable standard. EU Annex I (General Safety and Performance Requirements) of the MDR requires that sterilization processes be validated. ISO 22441 provides that validation framework, and Notified Bodies reviewing technical documentation are applying it. The absence of formal OJ harmonization does not create a gap — it creates a near-term expectation of formal recognition that current Notified Body practice anticipates.

For pharmaceutical manufacturers operating VHP isolators and RABS under EU Annex 1 (2022 revision), ISO 22441 also provides the validation framework for isolator decontamination cycle development and qualification. Annex 1 Section 4.22 requires that sporicidal agents used in isolators be validated — ISO 22441 is the standard against which that validation is performed.

Health Canada: ISO Harmonization Through MDR 2.0 Pathways

Health Canada regulates medical devices under the Medical Devices Regulations (SOR/98-282). For sterilization, Health Canada's regulatory guidance references ISO sterilization standards as the applicable technical frameworks. Health Canada's guidance on medical device submissions cites ISO standards for terminal sterilization processes — including ISO 11135, ISO 11137, and ISO 17665 — as the recognized validation frameworks.

ISO 22441 extends this framework to VHP without requiring a jurisdiction-specific standard. Health Canada's approach is explicitly ISO-harmonized: if a sterilization process is validated per the applicable ISO standard, that validation satisfies Health Canada's evidentiary requirements for the sterilization section of a medical device licence application. For VHP, ISO 22441 is that standard. Manufacturers with Canadian licence applications for devices sterilized by VHP should reference ISO 22441:2022 and their process validation documentation in exactly the way they would reference ISO 11135 for an EtO-sterilized device.

Health Canada's increasing regulatory coordination with FDA through Canada-U.S. Regulatory Cooperation Council initiatives reinforces this alignment — FDA's Category A recognition and ISO 22441 consensus standard designation create reference points that Health Canada's technical reviewers apply.

TGA: Australia's ISO-Referenced Regulatory Framework

The Therapeutic Goods Administration (TGA) regulates medical devices under the Therapeutic Goods Act 1989 and the Therapeutic Goods (Medical Devices) Regulations 2002. TGA's approach to sterilization validation is explicitly standard-referenced: the TGA Guidance Document on Sterilisation of Therapeutic Goods lists ISO sterilization standards as the applicable technical requirements for device registration submissions.

ISO 22441 is recognized within TGA's standard-referenced framework as the applicable standard for VHP processes. TGA's guidance structure requires that sterilization processes be validated to the applicable ISO standard for the sterilization method used — for VHP, ISO 22441 satisfies that requirement. Australian sponsors registering VHP-sterilized devices on the Australian Register of Therapeutic Goods (ARTG) should reference ISO 22441:2022 validation documentation in the technical file alongside the device's conformity assessment evidence.

TGA's mutual recognition arrangements and regulatory convergence with comparable overseas regulators — including FDA, EU authorities, and Health Canada — also create a secondary acceptance mechanism. Technical documentation accepted by FDA under ISO 22441 and Category A recognition carries interpretive weight in TGA reviews, particularly under TGA's regulatory framework for manufacturers with FDA approval or EU CE-marking.

PMDA: Japan's Harmonization Through STED and ISO Alignment

The Pharmaceuticals and Medical Devices Agency (PMDA) regulates medical devices in Japan under the Act on Securing Quality, Efficacy and Safety of Products Including Pharmaceuticals and Medical Devices (Pharmaceutical and Medical Device Act, or PMD Act). Japan's regulatory framework for medical devices is closely aligned with ISO standards through the STED (Summary Technical Documentation) format used for medical device applications.

PMDA accepts ISO 22441:2022 as the applicable validation standard for VHP sterilization processes in device applications. Japan's ISO harmonization in medical device sterilization is systematic: each sterilization method has an applicable ISO standard, and PMDA technical reviewers apply those standards in documentation review. MHLW Ministerial Ordinance No. 169, which governs manufacturing control and quality management for medical devices, requires that sterilization processes be validated — ISO 22441 provides that validation framework for VHP.

Manufacturers seeking Japanese approval for VHP-sterilized devices should structure their technical documentation with an ISO 22441-aligned sterilization section, referencing process development, IQ/OQ/PQ documentation, biological indicator data, and residue assessment results. PMDA's technical review of sterilization sections follows ISO standard structures; documentation built to ISO 22441 specifications translates directly into the format PMDA reviewers expect.

The Single-Validation Architecture

The practical consequence of ISO 22441's acceptance across these five jurisdictions — the United States, the European Union, Canada, Australia, and Japan — is that a single, well-constructed VHP validation package now serves as the technical foundation for sterilization sections in submissions across all five markets.

This is not theoretical. The actual documentation outputs of an ISO 22441-aligned validation program — the installation qualification report, operational qualification data, performance qualification results with biological indicator challenge data, material and packaging compatibility assessments, and residue testing under ISO 21396 — are the same documents that serve all five regulatory contexts. What changes across jurisdictions is the submission format and the regulatory authority receiving the documentation, not the underlying technical content.

For device manufacturers with multi-market commercial strategies, this has a specific economic value. Sterilization validation is expensive: equipment qualification, biological indicator testing, material compatibility studies, three consecutive successful PQ runs, and the validation reporting that supports them represent a substantial investment in engineering and laboratory resources. Under the prior VHP regulatory landscape — before ISO 22441 and before Category A recognition — that investment produced a primarily U.S.-applicable document set. Under the current landscape, it produces a globally portable regulatory asset.

The manufacturers who understand this are calibrating their sterilization validation investments accordingly. A VHP validation program designed with ISO 22441 compliance as the governing standard is not just a U.S. submission package — it is the technical foundation for five regulatory markets simultaneously.

What "Notified Body Certification" Actually Means

For EU market access, the Notified Body certification process deserves specific attention. Notified Bodies are the EU-authorized conformity assessment organizations that review technical documentation and issue CE-marking certificates for medical devices. SGS, TÜV SÜD, and BSI are among the Notified Bodies with active VHP-sterilized device certification programs.

The certification process is technical file review plus audit of the manufacturer's quality management system. For sterilization, the Notified Body reviewer evaluates whether the sterilization process described in the technical file is validated per an applicable standard, whether the validation data support the claimed SAL, and whether the ongoing monitoring program is adequate. For VHP processes validated per ISO 22441, the reviewer applies ISO 22441's requirements as the baseline — the same role ISO 11135 plays for EtO.

SGS's public service documentation explicitly identifies ISO 22441 validation testing as a service offering for CE-marking purposes. This is not incidental — it reflects the practical reality that Notified Bodies are receiving ISO 22441-based technical documentation in current CE-marking reviews and are applying the standard as the relevant technical framework.

Internal Links and Related Resources

Manufacturers evaluating VHP's global regulatory profile should review the technical capabilities that underpin ISO 22441-compliant validation programs. PuroGen's [SteriFlex platform](/steriflex) is specifically designed around the programmable parametric control — independent control of VHP concentration, temperature, humidity, exposure time, and aeration — that ISO 22441 validation programs require. The [science and validation documentation](/science) on which ISO 22441-compliant programs depend reflects the validation heritage PuroGen has built across decades of sterilization development. For manufacturers evaluating device-specific regulatory pathways, [the medical devices page](/medical-devices) provides context on the FDA submission framework that ISO 22441 supports.

Frequently Asked Questions

**Is ISO 22441:2022 a harmonized standard under EU MDR?**

Not yet formally — it has not been cited in the Official Journal of the European Union as a harmonized standard under EU MDR 2017/745. However, Notified Bodies are actively accepting ISO 22441-aligned technical documentation in CE-marking reviews, treating it as the applicable international standard for VHP sterilization. Formal harmonization, when it occurs, will formalize current Notified Body practice rather than change it. Manufacturers should not wait for formal harmonization before using ISO 22441 — the standard is in active use in EU submissions now.

**Does Health Canada require a separate VHP validation standard?**

No. Health Canada's sterilization guidance is ISO-harmonized. A VHP process validated per ISO 22441:2022, with complete IQ/OQ/PQ documentation, satisfies Health Canada's technical requirements for the sterilization section of a medical device licence application. No jurisdiction-specific standard or supplementary documentation is required.

**Can a single ISO 22441 validation package support both an FDA 510(k) and a CE-marking application?**

Yes. The technical content of an ISO 22441-aligned validation package — process development data, IQ/OQ/PQ reports, biological indicator results, material and packaging compatibility assessments, residue testing — is the same documentation that supports both submission types. What differs is the submission format and regulatory recipient. Manufacturers should structure their validation documentation to meet ISO 22441 requirements completely; the resulting document set is then formatted for each regulatory submission context without requiring additional validation work.

**What is ISO lifecycle stage 90.20, and does it affect ISO 22441's validity?**

Stage 90.20 is ISO's systematic review stage, in which the technical committee evaluates whether a published standard requires amendment, revision, or reaffirmation. A standard at stage 90.20 is fully active and in current use — the stage designation indicates it is under quality review, not that it is being withdrawn or superseded. ISO 22441 is in active use across all five jurisdictions examined in this article. No withdrawal or replacement action is underway.

**What residue testing standard applies to VHP-sterilized devices in EU submissions?**

ISO 21396:2022 is the standard for measurement of hydrogen peroxide residuals in and on medical devices sterilized by VHP. ISO 22441 references ISO 21396 for residue assessment as part of the performance qualification process. EU submissions should include ISO 21396-compliant residue testing data alongside the ISO 22441 validation documentation. Acceptable residue limits are established through biocompatibility assessment per ISO 10993-17.

**How does PMDA's review of VHP sterilization differ from FDA's?**

PMDA's technical review follows ISO standard structures through the STED documentation format. The underlying technical requirements — process validation per ISO 22441, SAL 10⁻⁶, biological indicator challenge data, residue testing — are equivalent to FDA's. The submission format differs: PMDA applications follow STED structure, while FDA submissions follow the CTD or device-specific format. The validation documentation content is the same; the packaging of that content for submission differs. Manufacturers with existing ISO 22441-aligned FDA validation packages have the technical content required for PMDA; the submission formatting is what requires jurisdiction-specific adaptation.