ISO 11138-7-2019 PDF

Full title and description

Sterilization of health care products — Biological indicators — Part 7: Guidance for the selection, use and interpretation of results. This International Standard provides guidance on selecting appropriate biological indicators (BIs), applying them in development, validation and routine monitoring of sterilization processes, and interpreting BI results for process control and quality assurance.

Abstract

This document gives practical guidance for the selection, placement, use and interpretation of biological indicators used to assess sterilization processes. It addresses use of BIs in developing, validating and routinely monitoring sterilization cycles, and clarifies limitations (for example it does not apply to processes relying solely on physical removal of microorganisms, certain combination processes, liquid immersion sterilization or to specified vapour‑phase hydrogen peroxide applications for isolators/rooms).

General information

• Status: Published (current; reviewed and confirmed in 2024).
• Publication date: March 2019 (ISO publication: 2019-03, first edition).
• Publisher: International Organization for Standardization (ISO); adopted by national bodies and published through regional/sector publishers (e.g., AAMI, national standards organisations).
• ICS / categories: 11.080.01 — Sterilization and disinfection in general.
• Edition / version: Edition 1 (2019).
• Number of pages: 64 pages in the ISO PDF (page counts reported for national/adopted publications can vary; some national editions list higher counts due to national forewords/annexes).

Scope

ISO 11138-7:2019 provides recommendations and guidance for selecting biological indicators, selecting appropriate test organisms/carriers where relevant, placing BIs within loads, interpreting positive and negative BI results, and integrating BI data into sterilization validation and routine monitoring programmes. The standard explicitly excludes processes relying solely on physical removal (e.g., filtration), some combination processes (e.g., washer-disinfectors combined with other treatments), liquid immersion sterilization and certain room/isolator vapourized hydrogen peroxide biodecontamination applications. It is intended to be used alongside the process‑specific BI requirements given in other parts of ISO 11138.

Key topics and requirements

• Guidance on selecting the correct type of biological indicator for the sterilization technology and intended use (e.g., self‑contained BIs vs. carrier-based BIs).
• Recommendations for BI placement within product loads and process challenge device use to achieve representative monitoring.
• Interpretation of BI results: distinguishing between routine negative/positive outcomes, investigating failures, and linking BI outcomes to corrective actions and revalidation.
• Limitations and non‑applicability statements (filtration-only processes, certain VHP room/isolator applications, liquid immersion).
• Connection to process‑specific BI requirements in other parts of ISO 11138 and to microbiological/sterilization process standards used for validation and control.

Typical use and users

Primary users include sterilization validation engineers, hospital sterile services/central sterilization departments, manufacturers of biological indicators, medical device manufacturers performing process validation, contract sterilization providers, test laboratories and regulatory/compliance personnel responsible for sterilization control. The document is used during method selection, process qualification, routine monitoring programme design and when investigating sterilization failures.

Related standards

ISO 11138-7 sits within the ISO 11138 series (Biological indicators). Closely related parts include ISO 11138-1 (General requirements), ISO 11138-2 (Ethylene oxide BIs), ISO 11138-3 (Moist heat BIs), ISO 11138-4 (Dry heat BIs), ISO 11138-5 (Low‑temperature steam and formaldehyde BIs) and ISO 11138-8 (method for validation of a reduced incubation time). Work on Part 6 (hydrogen peroxide / vapour hydrogen peroxide BIs) has been active in ISO/TC 198 and related drafts have been developed; however Part 6 status has been in development with project activity reported separately. Users should consult the appropriate process‑specific part together with Part 7 for guidance.

Keywords

biological indicator; sterilization; validation; routine monitoring; sterilizer performance; interpretation of results; process control; ISO 11138; health care products; D‑value; incubation time; BI placement.

FAQ

Q: What is this standard?

A: ISO 11138-7:2019 is an International Standard that provides guidance for selection, placement, use and interpretation of biological indicators used in the development, validation and routine monitoring of sterilization processes for health care products.

Q: What does it cover?

A: It covers practical guidance on choosing suitable BIs for different sterilization processes, where to place BIs in loads and process challenge devices, how to interpret positive and negative BI results, and steps to take after failures. It also specifies what it does not cover (e.g., filtration-only processes, certain liquid immersion processes and specified VHP room/isolator biodecontamination uses).

Q: Who typically uses it?

A: Sterilization validation engineers, hospital sterile services, medical device manufacturers, BI manufacturers, contract sterilizers, test laboratories and regulatory/compliance staff use this guidance when designing monitoring programmes, validating sterilization processes and investigating sterilization anomalies.

Q: Is it current or superseded?

A: ISO 11138-7:2019 is the current published edition (first edition, March 2019). The ISO bibliographic record indicates the publication was reviewed and confirmed (remains current) in 2024. It superseded ISO 14161:2009 as the guidance document in the ISO series. Users should check national/adopted versions for additional national forewords or deviations.

Q: Is it part of a series?

A: Yes — Part 7 is one part of the ISO 11138 series on biological indicators. Related parts address general requirements and process‑specific BIs (Parts 1–5, Part 8 for reduced incubation validation, and work on Part 6 for hydrogen peroxide processes is in progress under ISO/TC 198). For complete conformity and validation programmes, Part 7 should be used together with the applicable process‑specific part(s).

Q: What are the key keywords?

A: Biological indicator, sterilization, validation, monitoring, interpretation of results, BI placement, sterilizer performance, ISO 11138, health care products.