Medical Device Sterilization Validation & Microbiology Laboratories
Sterilization validation shows that a defined process reliably achieves the required sterility assurance level for a device. The laboratory work behind it typically includes bioburden determination, sterility testing, biological indicator work, bacterial endotoxin testing and, for ethylene oxide, residual analysis. The process-specific standards (ISO 11135 for EO, ISO 11137 for radiation, ISO 17665 for moist heat) set the validation approach; the sterilizer and the laboratory usually work together.
What does it measure?
- Bioburden on product before sterilization
- Sterility of product after exposure
- Biological indicator inactivation
- Bacterial endotoxin levels
- EO and ECH residuals (ISO 10993-7)
- Dose-mapping support for radiation
When is it used?
- Initial sterilization validation
- Periodic dose audits and requalification
- Product or packaging changes affecting sterilization
- Changing sterilizer or sterilization method
Sample considerations
- Provide finished, packaged product from representative lots.
- Tell the laboratory the sterilization method, sterilizer and target SAL.
- Bioburden and dose-audit programmes need product on a recurring schedule.
Laboratories with relevant capabilities
- Micro-Serve Laboratorium (Veenendaal, Utrecht) — Microbiology Testing, Sterility Testing, Sterilization Validation
- Canyon Labs (Bluffdale, UT) — Microbiology Testing, Sterility Testing, Package Testing
- Nelson Laboratories (Salt Lake City, UT) — Microbiology, Sterility Testing, Biocompatibility
- Pace Analytical Life Sciences (Oakdale, MN) — Microbiology, Sterility Testing, Chemical Analysis
- Medistri (Domdidier, Fribourg) — Sterility Testing, Biocompatibility, Microbiology
Frequently asked questions
- Does the laboratory validate my sterilization process?
- Usually the validation is a joint effort: the sterilization provider runs the process and the laboratory performs bioburden, sterility, biological indicator and residual testing. Ask each party what they own.
- Is ISO/IEC 17025 accreditation enough?
- It shows technical competence for the accredited methods. Your quality system, the sterilization standard and the regulator may impose other expectations — check scope and ask about relevant certification or regulatory inspection history.