Interlaboratory Comparison Testing

Interlaboratory Comparison (ILC) tests are used to assess the performance of a laboratory or to validate a test method. 

ILC testing at GEVES

Interlaboratory Comparison (ILC) tests are used either to assess the performance of a laboratory or to validate a test method. These two types of ILC are known as Proficiency Testing and  Method Validation.

Proficiency testing is used to assess the competence of a laboratory. It is carried out in order to monitor approved laboratories, who also use ILCs to adjust their testing process at the beginning of the seed season. Proficiency tests are also requested by GNIS-SOC for laboratory approvals, and by the French Seed Association (UFS) as decided by the purity, germination and health quality commissions of the flower and vegetable sections.

Method validation testing is used to test a method in different laboratories with different operators. It plays a key role in the method development process, in particular for international research projects.

It is also possible to organise mini-comparisons with two or more participating laboratories, on the same basis as an ILC. The organisation of these mini-comparisons and the statistical processing of results is adapted to the smaller number of laboratories involved.

Proficiency testing, method validation, and mini-comparison ILCs can be organised by contacting the SNES.

At GEVES, ILCs are organised in accordance with the principles of the 17043 accreditation standard.  The competence of the teams involved with regard to the tests and species concerned is instrumental.

Regardless of the framework chosen by the ILC’s prescribing body (SOC, UFS or other), GEVES guarantees total anonymity and confidentiality. This is ensured by assigning a code identity to both participants and samples.

GEVES has developed an online platform that enables ILC participants to access documents and files online for each of their ILCs, and to acknowledge receipt of their samples.


Go to the ILC website



ILC Programme

Type of ILC Species Test or pathogen GEVES contact EIL code Delivery of samples Results returned to participants Report available Participation in this ILC is open to :
Proficiency Tomato

Solanum lycopersicon L.

Clavibacter michiganensis subsp. michiganensis (Cmm) SNES 2020-GEVES-Tomato-Ba 01/09/2020 30/10/2020 15/12/2020
Proficiency Tomato

Solanum lycopersicon L.

Tobamoviruses (by biotest) SNES 2020-GEVES-Tomato-Vi 2 nd half of 2020
Proficiency Wheat Pathology : Tilletia spp. SNES 2019-GEVES-BLE-MY 2nd half of 2020

*Depending on availability of seed lots


Participate in an ILC


ILC assistance

Have you participated in a proficiency testing ILC?

GEVES can assist you in reviewing the report and implementing the necessary corrective action (training, double reading, self-testing with seed control kits or reference samples).


To sign up for an ILC*, to request the organisation of an ILC or mini-comparison, or for assistance following your participation in an ILC, please contact our ILC correspondents:

For seed quality ILC testing: SNES

Annie Saussaye


Tel: +33 (0)2 41 22 58 22

For ILC testing using biochemical and biomolecular techniques: BioGEVES

Patricia Lem


Tel: +33 (0)5 46 68 31 01


*Participation in ILC testing organised within the framework of laboratory approval is compulsory for approved laboratories for the species and tests in their scope of approval.