Diagnostic radiology quality assurance NABL 136 Diagnostic X-Ray QA Testing 2026: Accreditation, AERB Requirements and Test Parameters Updated: 13 September 2026 Short answer: NABL 136 is the specific-criteria document for accreditation of Quality Assurance Testing Facilities that test diagnostic radiology X-ray equipment. The current NABL register lists Issue 02 dated 24 August 2021 with Amendment 01 dated 4 April 2025, which remains the current published version in September 2026. The criteria supplement ISO/IEC 17025:2017 and cover QA work including type-approval demonstration, manufacturer-premise testing, acceptance testing, periodic QA and QA after major repair, servicing or maintenance. AERB separately requires periodic QA of diagnostic X-ray equipment and currently states that routine QA should be carried out at least once every two years and after repairs with radiation-safety implications. Diagnostic X-ray quality assurance is not only an...