Looking for help in calculating your validation results and the uncertainty associated with your test method?

Verification and/or validation of test methods are essential aspects of a laboratory’s work in accordance with UNE-EN ISO/IEC 17025.

To carry out validations, there are different techniques, and we highlight the 3 fundamental ones:

  • Comparison against a stable and known value using a reference material available in sufficient quantity for quantification.
  • Laboratory preparation of the known reference value using standards and doping a matrix of interest.
  • “Validation by pair values” is employed when we cannot resort to the other two, either due to the impossibility of doping the samples or the lack of quantity to perform sufficient repetitions with reference materials.
Laboratories should perform validations following a documented procedure and use the above methodologies as appropriate. To implement any of the techniques, calculations need to be performed to confirm that established prerequisites are achieved that determine whether the validation is fit for purpose or not. By checking certain validation parameters such as precision (in repeatability and/or reproducibility) and accuracy, as the most prominent of the validation. In addition, another important requirement when performing validation calculations for a test method when working according to UNE-EN ISO/IEC 17025 is the determination of the test uncertainty. There are different methodologies for its calculation and some of them can be complicated. For this reason, it is recommended that the laboratory has a procedure and tools that allow its evaluation to be carried out in a simpler way and minimising the possibility of calculation errors. The results of the experiments performed during validation allow, by comparison with the prerequisites, the declaration of the validation of the test method and the establishment of acceptable values for quality controls.

At GSC we create versatile validation procedures and uncertainty estimation spreadsheets.

At GSC we want to make your day-to-day tasks easier, providing you with the tools to improve your organisation.
They allow you to perform calculations related to the validation of your quantitative tests, following any of the techniques mentioned earlier, in a simpler manner.
They include an extract of the procedure detailing each of the procedures so that you can implement the one that best suits your needs.
They allow you to perform the calculation of uncertainty based on the method validation results.
Reduces the time spent and the possibility of errors, as they are validated and protected for use.
Once the validation process is finished and completed, GSC will continue to help you. We also provide you with spreadsheets that allow you to simplify the quality assurance of your routine results, whether for physicochemical or microbiological methods. In this way, you can check that your assays remain under control at all times, verifying compliance with the quality control criteria arising from validation. At GSC we offer you a set of tools together with different documents that show you the necessary steps to follow in order to help you validate the chemical methods performed by your laboratory. Because, with our procedures, the reliability of your analysis results is guaranteed. Validate your laboratory’s chemical test methods with the offer we provide, which includes:

Discover the spreadsheets we have available.
If you don't find the one you need, please contact us.

If you want more information about other products to enhance your laboratory, feel free to visit:
  • Chemical validation
  • Internal physicochemical quality control
  • Estimation of uncertainty in the results of multiparametric pesticide residue testing
  • Dilutions
Don’t know which reference materials you need, how to define performance requirements for your test method, or which validation technique is most suitable for your case? Contact us for any questions or check the catalog of control materials for both agri-food and environmental sectors.

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If you are also interested in other products to improve your laboratory, do not hesitate to visit us:


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