Hello,

You want to have a company that provides you an aid during the prepration for the surveillance audit and help you implement the ISO 17025 or you look for the company that will actually make the accreditation and grant you the ISO cert?

If the first one, you need to find a advisrtoy company, if the second ask local NB (Notified Bodies) like TUV Nord, TUV Rheiland, TUV SUD, etc. maybe they are able to do it. 

The text below is extracted from R103 - GENERAL REQUIREMENTS: PROFICIENCY TESTING FOR ISO/IEC 17025 LABORATORIES:

I. Proficiency Testing Providers

Applicants and accredited laboratories are required to participate in relevant and available PT provided by organizations administering acceptable PT programs. A2LA strongly recommends that laboratories participate in PT programs operated by accredited PT providers. Where appropriately accredited PT providers are not available, laboratories should use programs that follow ISO/IEC 17043 for PT programs.

Acceptable participation in PT programs is as follows:

 Programs that are available through commercial proficiency testing programs (see listing on the A2LA web site), and;

 Programs that are available through well-organized inter-laboratory comparisons (ILCs).

If these programs are suitable and relevant to the scope of accreditation, la

boratories must participate in these programs.

ILCs should be designed, wherever possible, to follow ISO/IEC 17043. A

cceptability of such programs will be made on a case-by-case basis by the assessor using the A2LA

A316 - Guidance for Review of Proficiency Testing Reports, and will be based on the design of the program, its frequency, the suitability of the samples, and defined

written criteria for data analysis and corrective action. For guidance on determining whether the PT summary reports of non-accredited PT providers meet ISO/IEC 17043, please consult the aforementioned ‘Guidance’ document.

There are also instances where PT providers are specified within an accreditation program recognized by regulation and participation in these PT programs is mandatory.

International Programs: Often, A2LA is made aware of relevant programs organized through our international counterparts. When possible, A2LA will notify accredited laboratories of the existence of these programs, which are

often one-time studies for the purpose of comparing methodologies. If no other relevant programs exist that can demonstrate a laboratory’s on going competency, laboratories will be asked to participate in these international comparison studies. 

The EPTIS database (www.eptis.bam.de) provides information about the organizers of proficiency testing,

In this database you'll find a large share of PT providers, the database contains up to 2888 PT schemes.

I hope you can find there what you need.

Thank you very much for your answer krzysztof, Ionel and Sergio it's helpful information