Examples
Worked examples
- Is an instance
A hospital central sterile processing department sets its biological indicator (BI) testing schedule directly from ST79: every load containing an implantable device is held until a negative BI result returns, and every sterilizer is challenged with a BI at least once each day of use.
- Is an instance
A sterile processing technician commissioning a newly installed pre-vacuum steam sterilizer follows ST79's IQ/OQ/PQ sequence, including consecutive Bowie-Dick air-removal tests and biological indicator challenge tests, before releasing the sterilizer for routine clinical use.
Counter-examples
Looks similar, but isn't
- Not an instance
A device manufacturer validating a moist-heat sterilization cycle for products it ships pre-sterilized to hospitals follows ISO 17665-1 (industrial/manufacturer moist-heat sterilization validation), not ST79 -- ST79 governs sterilization performed inside a health care facility's own sterile processing department, not at the point of manufacture.
Editorial commentary
ANSI/AAMI ST79 is the American National Standards Institute–approved consensus standard, developed by AAMI (the Association for the Advancement of Medical Instrumentation), that specifies how U.S. health care facilities should perform, monitor, and document steam sterilization of reusable medical devices. Its full title is Comprehensive guide to steam sterilization and sterility assurance in health care facilities. The current edition is ST79:2017, the consolidated base text incorporating amendments issued through 2020 — there has not been a full replacement edition since 2017, so searches for “ANSI/AAMI ST79 2020” and “ANSI/AAMI ST79 latest version” both point to this same amended 2017 text rather than a distinct new edition.
What Counts as ST79 Compliance
ST79 is a voluntary consensus standard, not a federal regulation in itself, but it functions as the de facto standard of care for hospital-based steam sterilization in the United States. A sterile processing department (SPD) is operating “to ST79” when its program covers, at minimum:
- Facility design and workflow that keeps decontamination, preparation/packaging, sterilization, and sterile storage functionally separated with unidirectional flow.
- Cycle-parameter selection and validation for each sterilizer and load type — time, temperature, and pressure for gravity-displacement versus dynamic-air-removal (pre-vacuum) cycles.
- Routine physical, chemical, and biological monitoring of every load, with defined release criteria for implant-containing loads.
- Installation, operational, and performance qualification (IQ/OQ/PQ) testing of sterilizers, including daily Bowie-Dick air-removal testing on pre-vacuum units.
- Documented policies for immediate-use steam sterilization (IUSS), wet-pack investigation, and recall procedures when a monitoring result fails.
Many state health department licensing rules and hospital accreditation surveys reference ST79 directly when assessing a facility’s sterile processing practices, even though the standard itself is not an FDA regulation.
Examples
Example 1 — biological indicator monitoring schedule
A hospital central sterile processing department sets its biological indicator (BI) testing schedule directly from ST79: every load containing an implantable device is held until a negative BI result returns, and every sterilizer is challenged with a BI at least once each day of use, not just for implant loads.
Example 2 — sterilizer qualification testing
A sterile processing technician commissioning a newly installed pre-vacuum steam sterilizer follows ST79’s IQ/OQ/PQ sequence — including consecutive empty-chamber Bowie-Dick air-removal tests and consecutive full-load biological indicator challenge tests — before releasing the sterilizer for routine clinical use.
What ST79 Is Not (Counter-Example)
A device manufacturer validating a moist-heat sterilization cycle for products it ships pre-sterilized to hospitals follows ISO 17665-1 (industrial/manufacturer moist-heat sterilization validation), not ST79. ST79 governs sterilization performed inside a health care facility’s own sterile processing department; it does not apply to sterilization performed at the point of manufacture, which sits under a different standards family entirely.
Related Standards
- ISO 17665-1 — moist-heat sterilization validation for device manufacturers, distinct from ST79’s health-care-facility scope.
- AAMI TIR12 — general guidance for designing and writing device reprocessing instructions, broader than ST79’s steam-sterilization focus.
- AAMI ST58 — the companion standard covering chemical (liquid/gas) sterilization and high-level disinfection, distinct from ST79’s steam-only scope.
Related CASRAI guides: Autoclave Validation: Using Biological and Chemical Indicators, How to Operate a Lab Autoclave: Cycle Types Explained, Autoclave Troubleshooting: Common Problems and Fixes, and Autoclave Operating Safety: Avoiding Steam Burns and Pressure-Related Injuries.
Frequently Asked Questions
What is the latest version of ANSI/AAMI ST79?
The current edition is ST79:2017, the consolidated base text plus amendments issued through 2020 (commonly cited as A1–A4). AAMI has not issued a full replacement edition since 2017.
What are the autoclave validation requirements under ST79?
ST79 calls for IQ/OQ/PQ testing at installation and after major repair or relocation, routine physical monitoring (time/temperature/pressure) on every cycle, a chemical indicator in every package, a biological indicator at least once daily per sterilizer and in every load with implantable devices, and periodic Bowie-Dick testing of dynamic-air-removal sterilizers.
Is ANSI/AAMI ST79 legally mandatory?
Not as a standalone federal law, but many state health department licensing rules, hospital accreditation surveys, and internal quality policies require or reference ST79 compliance, making it the practical baseline of care for U.S. sterile processing departments.
Machine-readable encodings
Use in your systems
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