ISO 13485 · Expert · 15 min lesson
Auditing sterilisation, bioburden and packaging validation
ISO 13485:2016 clauses 7.5.6, 7.5.7, 7.4 and 6.4; ISO 11135, ISO 11137, ISO 17665, ISO 11737-1, ISO 11607-1 and -2; ISO 19011:2018 clause 6
What you will learn
- Audit sterilisation validation records, requalification and change control against clause 7.5.7 and the ethylene oxide, radiation and moist heat standards.
- Audit bioburden and endotoxin monitoring, and the link between bioburden data and the sterilisation process definition.
- Audit sterile barrier packaging and shelf-life evidence against ISO 11607-1 and -2, and write a graded finding.
Key takeaways
- Clause 7.5.7 requires sterilisation and sterile barrier validation before use and after changes, with records kept.
- Requalification only proves the process for the load it tested, so the load diagram, probe map and indicators must be on file.
- Bioburden data (ISO 11737-1) must be trended and must stay within the assumption behind the process definition.
- Contract sterilisation stays the manufacturer's responsibility under clause 7.4; trace one lot end to end.
- Shelf life on the label needs ISO 11607 stability evidence, with real time data confirming accelerated ageing.
Free practice question
Halden's contract sterilizer sends a requalification report for the ethylene oxide cycle. It states that the cycle passed and gives the date, but it does not include a load diagram or probe map. The internal auditor must decide how to treat it.
What is the best audit response?
Accept it, because a pass means the process is valid.
Not quite. A pass on an undescribed load cannot be tied to routine loads, so ISO 11135 clause 12 evidence is missing.
Raise a finding because the evidence does not show the tested load represents routine production.
Correct. Clause 7.5.7 and ISO 11135 clause 12 require requalification evidence that represents the loads actually processed.
Ask the sterilizer for a lower price and move on.
Not quite. Price has no link to clause 7.5.7 requirements for validated and maintained sterilisation processes.
Reject the supplier immediately without any further enquiry.
Not quite. Clause 7.4 calls for evaluation and follow up first; an automatic rejection skips the evidence required by ISO 19011 clause 6.
Key terms
- bioburden: The population of viable microorganisms on or in a product or sterile barrier system before sterilisation (ISO 11737-1).
- performance qualification: Demonstrating with product in its real load that the process consistently delivers the required result (clause 7.5.6).
- requalification: Periodic or change-driven repetition of validation work to show the process remains effective (ISO 11135 clause 12).
- sterile barrier system: The minimum package that prevents microbial ingress and allows aseptic presentation (ISO 11607-1).
- endotoxin: Bacterial cell wall material measured by the bacterial endotoxin test, relevant for blood and nervous system contact.
- worst case load: The load configuration that most challenges penetration of the sterilizing agent, used for performance qualification.
Official sources
- ISO 13485:2016 Medical devices - Quality management systems - Requirements for regulatory purposes
- ISO 11737-1:2018 Sterilization of health care products - Microbiological methods - Part 1: Determination of a population of microorganisms on products
- ISO 11737-1:2018/Amd 1:2021
- ISO 11607-2:2019/Amd 1:2023 Packaging for terminally sterilized medical devices - Validation requirements
- ISO 17665:2024 Sterilization of health care products - Moist heat
Go further
The full lesson has narrated slides, more scenario questions with explained answers and a simulation.
Open the AcademyWatch on YouTubeIllustrative example. Educational only, not legal advice.