The importance of being fit for purpose

Significance of the Topic

Measurement accuracy underpins decisions in trade, healthcare, environmental monitoring and many other fields. Validating and verifying analytical methods ensures reliable results, reduces legal and financial risks and enhances confidence in critical decision making.

Objectives and Study Overview

This article presents the concept of method validation and verification as a framework to demonstrate that analytical procedures are fit for their intended use. It introduces key performance characteristics and highlights the role of the Eurachem Guide in standardizing laboratory practices.

Methodology and Instrumentation

The recommended approach focuses on single-laboratory studies to assess performance criteria such as:

• Precision (repeatability and intermediate precision)
• Trueness
• Selectivity
• Working range
• Analytical sensitivity
• Limit of detection and limit of quantification
• Ruggedness
• Sampling and subsampling procedures

The Eurachem Guide provides experimental designs and statistical tools for each characteristic, supporting comprehensive planning and documentation.

Key Results and Discussion

The Guide outlines how laboratories can translate client requirements into analytical specifications, conduct validation or verification experiments, compare outcomes to predefined criteria and report findings in a transparent manner. Quick reference tables streamline experiment selection and statistical evaluation. The material emphasizes that verifying standard methods requires less effort than full in-house validation and that regulatory demands must inform study scope.

Benefits and Practical Applications

Implementing the proposed validation and verification processes enables laboratories to:

• Demonstrate compliance with quality and regulatory standards
• Provide customers with trustworthy data for informed decisions
• Optimize resource use by focusing efforts on critical performance metrics
• Establish robust internal quality control plans based on validation data

Future Trends and Opportunities

Emerging developments include integration of validation workflows with digital lab notebooks and LIMS, expanded guidance on interlaboratory comparisons, greater emphasis on sampling validation and incorporation of artificial intelligence for data analysis. Enhanced regulatory harmonization and real-time performance monitoring are also anticipated.

Conclusion

Method validation and verification are essential to ensure that analytical procedures deliver accurate, reliable and fit-for-purpose results. The Eurachem Guide provides a structured, practical framework that supports laboratories in achieving and demonstrating measurement quality.

References

1. H. Cantwell ed. Eurachem Guide: The Fitness for Purpose of Analytical Methods – A Laboratory Guide to Method Validation and Related Topics 3rd ed 2025
2. V. Barwick ed. Planning and Reporting Method Validation Studies – Supplement to Eurachem Guide on the Fitness for Purpose of Analytical Methods 2nd ed 2025
3. H. Cantwell ed. Blanks in Method Validation – Supplement to Eurachem Guide on The Fitness for Purpose of Analytical Methods 2nd ed 2025
4. M. H. Ramsey P. D. Rostron F. C. Raposo eds. Validation of Measurement Procedures that Include Sampling Eurachem EUROLAB CITAC Nordtest AMC Guide 1st ed 2024