Overview
SIST EN ISO 16140-2:2016 (ISO 16140-2:2016) - "Microbiology of the food chain - Method validation - Part 2" - defines a harmonized protocol for validation of alternative (mostly proprietary) microbiological methods against an established reference method. The standard provides general principles and technical procedures for demonstrating that rapid, simplified or proprietary methods deliver equivalent or acceptable performance for the detection and/or quantification of microorganisms in the food chain.
This standard applies to:
- products intended for human consumption and animal feed
- environmental samples from food and feed production/handling
- samples from primary production
It is primarily intended for bacteria and fungi, with some clauses adaptable to other organisms (viruses, parasites) case-by-case.
Key technical topics and requirements
ISO 16140-2 establishes detailed validation pathways for both qualitative and quantitative alternative methods. Major technical topics include:
- General principles for validation: roles, documentation, and required expertise (microbiology and statistics).
- Method comparison studies (paired or unpaired): side-by-side testing of alternative vs reference methods across relevant sample types.
- Sensitivity and Relative Level of Detection (RLOD) studies for qualitative methods.
- Inclusivity and exclusivity testing to demonstrate correct detection of target organisms and exclusion of non-targets.
- Interlaboratory (collaborative) studies: design, measurement protocol, data analysis and interpretation to assess reproducibility.
- Quantitative validation elements: relative trueness, accuracy profile approach, limit of quantification, and associated statistical evaluation.
- Annexes that offer practical aids: classification of sample types, contamination protocols, RLOD models, strain selection guidance, and accuracy profile examples.
The standard emphasizes rigorous experimental design, appropriate sample selection (natural vs artificially contaminated), and statistical analysis consistent with microbiological variability.
Practical applications and who uses it
ISO 16140-2 is used by:
- Manufacturers and developers of alternative or proprietary microbiological test kits and rapid methods seeking validation data.
- Independent validation laboratories conducting method comparison and interlaboratory studies.
- Accreditation bodies and regulatory authorities assessing method performance for official control and certification.
- Food industry quality labs evaluating and implementing rapid methods for routine testing of raw materials, finished products, and production environments.
Benefits include faster, evidence-based adoption of rapid tests, transparent performance claims for end users, and a consistent framework for certification and regulatory acceptance.
Related Standards
- ISO 16140-1 - Vocabulary (part of the ISO 16140 series).
- Other parts under development address verification in single laboratories (Part 3), single-lab validation (Part 4), factorial interlaboratory validation (Part 5), and validation for confirmation/typing (Part 6).
Keywords: ISO 16140-2, SIST EN ISO 16140-2:2016, method validation, microbiology of the food chain, alternative methods, proprietary methods, reference method, interlaboratory study, inclusivity exclusivity, accuracy profile, RLOD, food microbiology.