Accrediting Body Requirements ANSI National Accreditation Board (ANAB) Go to section 1.4 of ANSI National Accreditation Board Accreditation Requirement AR2251. Perry Johnson Laboratory Accreditation Go to section 4.1 of PJLA document PL-1. American Association for Laboratory Accreditation (A2LA) See (PT3) on page 5 of A2LA document R103. IAS - International Accreditation Service See Policy on page 3 of IAS document IAS/TL-CL/031. NVLAP See PT Requirements – NVLAP on page 3 of NVLAP document Developing a Proficiency Testing Plan for your Laboratory.