BAB recognizes a wide range of Proficiency Testing (PT) Schemes offered by the PT providers listed with:

1)    APAC Proficiency Testing Directory 

https://www.apac-accreditation.org/about/proficiency-testing-programs/

2)    PT providers listed on the EPTIS database (www.eptis.org)
http://www.eptis.bam.de/en/index.htm

3)    Any other PT providers accredited on ISO/IEC 17043 by ILAC signatory AccreditationBodies.

http://www.ilac.org