The Bulk Asbestos Proficiency Analytical Testing Program (BAPAT) serves as an external quality assurance program for laboratories analyzing bulk building materials by polarized light microscopy (PLM). It is designed to provide bulk audit samples on a quarterly basis and to provide a means by which a laboratory can evaluate its ability to characterize bulk materials. The program is both qualitative and semiquantitative in nature.
Participation in proficiency testing activities is important to clients, potential customers, accreditation bodies, and other external entities. A laboratory’s competence can be demonstrated by an examination of the organization's PAT Report.