Laboratory Comparison Tests

What is Inter-Laboratory Comparison Test?

Laboratories can participate in inter-laboratory comparison tests with a limited number of participants instead of proficiency testing. Possible reasons for this practice include the absence of a suitable proficiency testing program, a low number of laboratories in the sector, and other factors. There may be specific situations where an independent organization, representing a laboratory or a group of laboratories, decides to organize an inter-laboratory comparison test. This group may consist of branches from the same organization or laboratories from different organizations. Naturally, there will be certain conditions that the regulatory body must adhere to and fulfill.

At Labsert, the inter-laboratory comparison tests we conduct under our Z-Test brand are organized with careful consideration of ISO 17043 requirements. Relevant international standards, guidelines, and documents are utilized in sample preparation, documentation, result acquisition, and reporting processes.

Participation and Registration Procedures

Our primary rule for participation in inter-laboratory comparison tests is that the participating laboratory must be accredited. If there are not enough participants for a test, laboratories may be accepted if they are in the process of accreditation or have a minimum of 3 years of experience in the relevant parameters. All participants are informed about this process. Laboratories that meet these requirements can participate in all of our comparison tests and may also apply to us with the matrix, parameters, and test dates to be determined by them within the scope of our special preparation comparison test.

The comparison test is always open on our program dates for the tests and matrices listed below. To obtain a price quote, simply select the option that suits you from the matrix below, choose the parameters you wish to participate in, and inform us of the appropriate month (at least one month in advance) for participation. After receiving your price offer, if you approve it, you can complete the payment up to 15 days before the test date and finalize your registration. We, as Labsert, are committed to ensuring that your corporate information, result reports, methods, and test data you send to us will never be shared with any third party, including individuals, companies, or institutions.

Test Programs

You can navigate to the parameters section by selecting the area of interest from the test groups below and clicking the corresponding button. All parameters of that matrix can be accessed in the Contents section. You may specify which parameters you wish to participate in and send them to us via email, indicating the appropriate month for participation. Additionally, you can review our sample result report to assess compatibility with ISO 17043 requirements for comparison tests.

Custom-Made Comparison Test

Custom-made external quality control tests refer to time and content-independent interlaboratory comparison tests offered for accredited laboratories. In this test group, the laboratory identifies the necessary content (for example, the required test parameters, the matrix property of the sample, the analysis method) and shares this information with the test provider. If the requested content is deemed suitable for the test cycle, a suitable date is arranged with the participant. Subsequently, the test is organized, and the comparison test report, which includes the Z score and other statistical results, is provided to the laboratory.

Custom-made external quality control tests are conducted with the participation of at least three or four accredited laboratories. When the test request is submitted to the test provider, this information is communicated to other laboratories, and those wishing to participate in the relevant test cycle are identified, allowing for the arrangement of the test cycle. You can complete the test request form via the link below.