Overview
EN ISO 16140-3:2021/A1:2025 (CEN endorsement of ISO 16140-3:2021 Amendment 1) updates the single-laboratory verification protocol within the ISO 16140 series to include verified identification methods of microorganisms. This amendment integrates the technical protocol for verifying validated identification methods (referencing ISO 16140-7) and clarifies how identification methods interact with confirmation and detection workflows in food microbiology. The amendment was approved by CEN in August 2025 and is intended for national adoption by February 2026.
Key topics and requirements
- Scope of verification: Verification of validated identification methods in a single laboratory focuses on implementation verification rather than full method comparison studies.
- Sample type: The verifiable sample is an isolated colony recovered on defined selective or non‑selective agar plates specified in the validation data.
- Implementation steps:
- Review the method’s validation data (from alternative methods validation report).
- Select the agar plate(s) tested during the validation study that match the laboratory’s scope; if multiple plates were validated, use the relevant combination.
- Demonstrate the laboratory can obtain the expected identification results on isolated colonies.
- Definitions added: New terms such as identification agreement, assigned identity, identification deviation, and identification method are included to standardize outcome reporting.
- Performance expectation: The amendment adds an entry to performance tables indicating identification method - panel of strains - 100% agreement as a verification metric (see Clause 8 / Table 16).
- Relation to other parts: Clarifies interplay with ISO 16140-6 (confirmation procedures) and ISO 16140-7 (validation of identification methods). Notes that whole-genome sequencing (ISO 23418) may become a future reference method.
Practical applications
- Verification of laboratory capability to perform validated identification workflows such as:
- Molecular identification (PCR, sequencing)
- Mass spectrometry (e.g., MALDI-TOF)
- Biochemical/phenotypic identification systems
- Ensures that identification results from colonies recovered on specified media are consistent with the validated method’s scope and database/algorithm.
- Useful when adopting commercially validated identification kits or in-house identification procedures that have prior validation reports.
Who should use this standard
- Food microbiology laboratories performing routine microbial identification
- Quality assurance and regulatory compliance teams in food industry
- Method developers and manufacturers of identification kits and instruments
- Accreditation bodies and laboratory assessors validating implementation competency
Related standards
- ISO 16140-3:2021 - Protocol for verification in a single laboratory (base document)
- ISO 16140-6 - Validation of confirmation methods
- ISO 16140-7 - Validation protocol for identification methods
- ISO 23418 - Whole-genome sequencing (future reference method potential)
Keywords: ISO 16140-3, EN ISO 16140-3:2021/A1:2025, method validation, microbiology of the food chain, identification methods, single laboratory verification, implementation verification, selective agar, ISO 16140-7.
