Overview
EN ISO 20836:2021 - "Microbiology of the food chain - Polymerase chain reaction (PCR) for the detection of microorganisms - Thermal performance testing of thermal cyclers" - specifies requirements for the installation, maintenance, temperature calibration and temperature performance testing of both standard thermal cyclers and real‑time thermal cyclers. Although developed for food‑testing laboratories, the standard is applicable to any PCR‑based application across the food chain and related domains (environmental testing, human and animal health, forensic testing).
This standard defines a physical measurement method that directly measures thermal performance in block‑based and heated‑chamber thermal cyclers, provides guidance on metrological traceability, and supports ISO/IEC 17025‑compliant calibration and testing.
Key topics and requirements
- Scope and definitions: terminology for PCR methods, thermal cyclers, temperature characteristics and measurement.
- Installation & maintenance: recommended practices to ensure reliable thermal performance over the instrument lifecycle.
- Temperature calibration: requirements for generating metrologically traceable calibration results.
- Temperature performance testing: a physical method for measuring block and tube temperatures to evaluate uniformity, accuracy and ramping behaviour with stated measurement uncertainty.
- Performance testing programme: periodic testing, documentation and acceptance criteria to verify suitability for intended PCR applications.
- Compliancy testing: procedures and examples for setting PCR‑method‑based specifications and assessing conformity.
- Optical performance (for real‑time cyclers): method for assessing optical detection systems in addition to thermal measurements.
- Annexes: informative guidance on sensor locations, a universal temperature protocol, compliancy procedures and example temperature profiles and test reports.
Practical applications
- Validate and document thermal cycler performance before method validation or accreditation.
- Support diagnostic and food‑safety laboratories in ensuring reproducible PCR amplification and reducing false results due to thermal errors.
- Provide manufacturers and service engineers with test methods for factory acceptance, servicing and repairs.
- Enable calibration laboratories to deliver ISO/IEC 17025‑traceable temperature calibrations for PCR instruments.
- Microbiology and molecular biology laboratories (food, environmental, clinical, veterinary, forensic)
- Quality assurance and laboratory accreditation personnel
- Instrument manufacturers, service providers and metrology/calibration labs
- Method developers and laboratory managers responsible for PCR‑based testing
Related standards
- ISO 22174 - General requirements and definitions for PCR in food microbiology
- ISO 20837 - Sample preparation for qualitative detection
- ISO 20838 - Requirements for amplification and detection for qualitative methods
- ISO/IEC 17025 - General requirements for the competence of testing and calibration laboratories
Keywords: EN ISO 20836:2021, thermal cycler, thermal performance testing, PCR, temperature calibration, real‑time thermal cycler, metrological traceability, ISO/IEC 17025, food microbiology.