Sterilization validation according to ISO 17665-1, EN 13060 and EN 285

ISO 17665-1 is the overarching standard for steam sterilization processes. It defines the process parameters, validation steps, and verifications required for each type of steam sterilizer. EN 13060 supplements these requirements for small sterilizers, commonly used in medical practices, outpatient clinics, and specialized departments. EN 285, on the other hand, addresses large sterilizers, such as those typically found in central sterile supply departments (CSSDs). The validation principles are identical but differ with regard to load volume, steam generation, cycle design, and sensor technology. HygCen Germany takes these differences into account but verifies only the technical effectiveness - not the process design.

ANSI/AAMI ST79 is the authoritative US standard for steam sterilization and sterile supply. Manufacturers exporting products to the US market, or operators requiring US compliance, benefit from having their sterilization processes additionally tested against these requirements. ST79 specifies expectations regarding steam penetration, loading, sensors, monitoring, and documentation. HygCen Germany can demonstrate whether the sterilization programs used meet not only European but also the relevant US performance criteria. However, this demonstration does not replace regulatory consulting it merely demonstrates the technical performance of the processes.

Steam penetration is one of the crucial effectiveness factors. We test whether the steam can penetrate even hard-to-reach areas, such as hollow bodies, edges, nested loads, or compacted trays. To this end, temperature sensors are placed in critical areas, and worst-case loads are defined. The measurement results must meet the required temperature-time specifications at all measuring points. If deviations are detected, we document them neutrally - adjusting the load or process parameters is the operator's responsibility.

If a cycle fails to meet the normative requirements - for example, insufficient holding times, inadequate steam penetration, or temperature deviations - this is documented neutrally and completely. Common causes can include unfavorable loading configurations, technical malfunctions, unsuitable programs, or altered environmental conditions. HygCen Germany evaluates only the test data; it does not provide process consulting or implement optimizations. The operator decides whether programs need to be adjusted, equipment serviced, or loading modified before a retest is conducted.

Re-validations are required at regular intervals - the exact frequency depends on the quality management system, manufacturer specifications, and operational requirements. Typically, re-validations are performed annually or on an ad-hoc basis, e.g., after repairs, equipment replacements, program changes, new loading concepts, or anomalies detected during monitoring. HygCen Germany fully documents the tests performed but does not specify its own intervals or operational procedures in order to maintain its neutral laboratory role.

Effective sterilization requires that cleaning (ISO 15883), cleanliness (ISO 19227, TOC/Protein/Hemoglobin), and packaging (ISO 11607-2) are already functioning correctly. Sterilization validation is therefore an integral part of the entire reprocessing chain. If upstream processes do not operate reproducibly, sterilization cannot achieve the required level of safety. For this reason, HygCen Germany considers washer-disinfector validation, cleanliness tests, and packaging inspections within a holistic context – without, however, providing consulting services or process design.