Clause 26, Korea Laboratory Accreditation Scheme Operation Manual (Proficiency Test)

• 1. An accredited testing laboratory should perform a proficiency test, approved by the director of KOLAS by medium classifications at least once in three years.
• 2. Though an accredited testing laboratory has participated in a proficiency testing according to article 2, it shall also take part in the proficiency testing the head of the accreditation body requests. If it doesn't, the head of the accreditation body can conclude that the laboratory would yield a nonconforming result.
• 3. To be an accredited testing laboratory, a testing laboratory shall participate in a domestic or international proficiency testing of its interested area (1 or more items in the categories of Attachment 1) approved by the head of the accreditation body and submit the result at the time of application for accreditation.

Proficiency Test Operational Procedure

Proficiency Test Application Guidance