Medical laboratory services play an important role in the healthcare system by providing diagnostic information that serves as a basis for clinical decision-making. Therefore, quality assurance mechanisms through the accreditation of medical laboratories are necessary to ensure compliance with service standards, patient safety requirements, and good laboratory governance. However, in practice, issues remain concerning the legal relationship between medical laboratory accreditation as an institutional standard and the professional practice authority of Medical Laboratory Technology Professionals (Ahli Teknologi Laboratorium Medik/ATLM) as healthcare professionals. This study aims to analyze the legal certainty of regulations governing medical laboratory accreditation in relation to ATLM practice and to formulate an appropriate regulatory framework for ensuring such legal certainty. This study employs a normative legal research method using a statutory approach and a conceptual approach. The legal materials consist of primary legal materials in the form of laws and regulations concerning medical laboratory accreditation and ATLM practice, as well as secondary legal materials, including relevant literature, scientific journals, and legal doctrines. The legal materials are analyzed qualitatively using a descriptive-analytical method to examine the relationship between medical laboratory accreditation regulations and the professional authority of ATLMs. The results show that the regulation of medical laboratory accreditation has a legal basis through healthcare regulations, particularly Law Number 17 of 2023 on Health and Minister of Health Regulation Number 34 of 2022 on the Accreditation of Healthcare Facilities. However, these regulations do not explicitly establish the relationship between the accreditation status of medical laboratories and the authority to practice as an ATLM. Accreditation is primarily oriented toward fulfilling institutional quality standards, whereas ATLM practice authority is determined by the competence, registration, and practice license of healthcare professionals. Therefore, regulatory harmonization is needed to establish a clear relationship between medical laboratory accreditation standards and professional ATLM practice, thereby ensuring legal certainty, legal protection, and the provision of quality laboratory services
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