ISO 11737-1-2018 PDF

Full title and description

Sterilization of health care products — Microbiological methods — Part 1: Determination of a population of microorganisms on products. This International Standard specifies requirements and provides guidance for enumeration and microbial characterization of viable microorganisms on or in a health care product, component, raw material or package.

Abstract

ISO 11737-1:2018 sets out methods for determining bioburden (the population of viable microorganisms) on healthcare products and related materials, gives guidance on microbial characterization appropriate to the intended use of bioburden data, and notes exclusions such as viral, prion or protozoan contaminants and environmental monitoring. Annex A provides guidance on Clauses 1 to 9.

General information

• Status: Published.
• Publication date: January 2018 (ISO 11737-1:2018).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 07.100.10 (Medical microbiology); 11.080.01 (Sterilization and disinfection in general).
• Edition / version: Edition 3 (2018); amended by ISO 11737-1:2018/Amd 1:2021.
• Number of pages: 48 pages (main document).

Scope

Specifies requirements and guidance for enumeration and microbial characterization of viable microorganisms on or in a health care product, component, raw material or package. It excludes enumeration/identification of viral, prion or protozoan contaminants (including agents of spongiform encephalopathies) and does not apply to environmental microbiological monitoring of manufacturing areas.

Key topics and requirements

• Methods for enumeration of viable microorganisms (direct and indirect techniques) and guidance on when each is appropriate.
• Criteria and procedures for microbial characterization of bioburden, scaled to the intended use of the data.
• Requirements for method suitability, recovery efficiency assessment, limit of detection considerations and use of correction factors.
• Guidance on reporting results, handling counts beyond ideal ranges, and application of risk-based approaches to bioburden assessment.
• Normative references to relevant laboratory competence and quality standards (for example ISO/IEC 17025, ISO 13485 where applicable).

These topics and requirements are described in the ISO 11737-1:2018 text and were further clarified by the 2021 amendment and associated guidance.

Typical use and users

Used by medical device manufacturers, contract testing laboratories, sterilization validation teams, quality and regulatory personnel, and clinicians responsible for device reprocessing. Typical applications include bioburden testing during product development, production release support, sterilization process validation and investigation of microbiological quality issues. US adoption/adaptation and guidance may be found in ANSI/AAMI-referenced materials.

Related standards

Part of the ISO 11737 series. The companion Part 2 covers tests of sterility used in definition, validation and maintenance of a sterilization process (ISO 11737-2, current edition 2019). ISO 11737-1:2018 is linked to sector standards and guidance such as ISO/IEC 17025 and ISO 13485; an amendment ISO 11737-1:2018/Amd 1:2021 was published to clarify specific points.

Keywords

bioburden; sterilization; medical devices; microbiological methods; method suitability; recovery efficiency; limit of detection; ISO 11737; sterility testing; microbial characterization.

FAQ

Q: What is this standard?

A: ISO 11737-1:2018 is an international standard that specifies methods and guidance for determining the population of viable microorganisms (bioburden) on health care products and related materials.

Q: What does it cover?

A: It covers enumeration techniques, microbial characterization, method suitability and recovery efficiency, limits of detection, reporting practices and related quality requirements; it excludes viral, prion and protozoan detection and environmental monitoring.

Q: Who typically uses it?

A: Medical device manufacturers, sterilization validation teams, contract microbiology labs, quality/regulatory professionals and others involved in product bioburden assessment and sterilization validation.

Q: Is it current or superseded?

A: ISO 11737-1:2018 is the current edition (published January 2018, Edition 3). It was amended by ISO 11737-1:2018/Amd 1:2021 and the standard was last reviewed/confirmed by ISO in 2023, so the 2018 edition with its amendment remains current.

Q: Is it part of a series?

A: Yes — ISO 11737 is a multi-part series. Part 1 covers determination of a population of microorganisms; Part 2 covers tests of sterility used for defining, validating and maintaining sterilization processes (current Part 2 edition 2019).

Q: What are the key keywords?

A: Bioburden, microbiological methods, sterilization, medical devices, method suitability, recovery efficiency, limit of detection, microbial characterization.