Proficiency tests at WFSR

Information about the 2026/2027 programme can be found below.

Every year WFSR organises new proficiency tests. For these tests, it is not yet certain whether they will go ahead, due to the availability of test samples and the number of participants. If you have expressed interest in (one of) these new tests, you will be kept informed about the progress of these proficiency tests.

E-mail contact: pt.wfsr@wur.nl

• Preparation and quality control of test material.
• Shipping of test materials and instructions to participants.
• Preparation of proficiency test materials may be outsourced from time to time. When outsourcing takes place, it is placed with a competent subcontractor and WFSR is responsible for this work.

• Laboratories test the samples according to their own routine method.
• Report their results online to WFSR as instructed and within the specified timeframe (usually within 6-7 weeks).
• WFSR's website provides a fast, easy and efficient way to submit results.

• The results will be analyzed and the laboratories' performance will be assessed using appropriate statistical techniques.
• A report will be prepared containing anonymized results, statistical analysis, and a description of the methods used.
• The report will be provided/sent to the participants as soon as possible after the round has ended.

If a laboratory has any doubts about the assessment of its performance in a proficiency test, it should contact pt.wfsr@wur.nl. 
A confirmation of receipt will be sent within five days, including a statement confirming the admissibility of the complaint. If the complaint/appeal is upheld, it will be handled according to our internal procedure for complaints, quality deviations, and appeals, by means of a root cause analysis. Appropriate measures will be taken, and if necessary, a revised report will be sent to the laboratory and other relevant laboratories. The complaint/appeal will be treated confidentially.

WFSR has been accredited since 2006 (number R013 at www.rva.nl) for the organization of proficiency tests by the Dutch Accreditation Council (RvA). The accreditation is based on ISO/IEC 17043n and encompasses the organization's quality system and all parameters specified in the scope.

For more information about our accreditation, please visit the Dutch Accreditation Council's website.

For more information about our certificate, please email pt.wfsr@wur.nl.