International organization for standardization 15189 in medical laboratory practice: A review of standards and implementation

Global adoption and implementation

The adoption of ISO 15189 is growing substantially worldwide, reflecting its importance and global recognition for enhancing patient care and diagnostic quality.^[7] Hence, the standard has been widely adopted in many developed countries and is sometimes integrated with other national accreditation systems (such as the College of American Pathologists, Clinical Laboratory Improvement Amendments [CLIA], and the United Kingdom National External Quality Assessment Service). The aim of raising laboratory quality and conforming to international standards has driven the growing acceptance of ISO 15189 in developing countries. In nations, the adoption of ISO 15189 is increasing, often driven by the desire to improve laboratory quality and align with international standards.^[1] The implementation of ISO 15189 in India is largely attributed to the National Accreditation Board for Testing and Calibration Laboratories, and the number of accredited medical laboratories has been continuously increasing.^[8] The ISO 15189:2022 revision has further supported global adoption by introducing a more flexible, outcome-based, and risk-oriented framework, allowing laboratories with varying resource capacities to implement the standard more effectively compared to the more prescriptive ISO 15189:2012 version.^[5]

Accreditation trends and integration with regulatory frameworks

The number of accredited medical laboratories is steadily rising worldwide. As of 2024, more than 114,600 laboratories globally have received accreditation under various standards, according to the International Laboratory Accreditation Cooperation.^[9] The number of accredited laboratories is growing annually, reflecting the standardized quality and expertise in medical laboratories, especially in Asia and Africa, where healthcare infrastructure is expanding.^[10] The World Health Organization (WHO) and the ILAC are key players in encouraging the global adoption of ISO 15189.

As a global network of accrediting organizations, ILAC ensures cross-border harmonization of quality standards, enabling laboratories to conform to internationally accepted standards.^[11] Furthermore, WHO also promotes the expansion of accredited laboratories in regions with limited resources and supports the accreditation of ISO 15189 in order to improve healthcare services.^[12]

The integration of ISO 15189 has been crucial to ensuring uniformity and enhancing laboratory quality across various systems under national and regional regulatory frameworks. CLIA provides basic requirements for laboratory operations in the United States. ISO 15189 provides a more comprehensive QMS framework, whereas CLIA primarily focuses on laboratory procedures and personnel regulations. To meet quality and regulatory requirements, many laboratories, particularly those in complex sectors, combine ISO 15189 accreditation with CLIA certification.^[2] In a comparable way, the NABL in India has closely integrated ISO 15189 with its accreditation program in order to ensure that medical laboratories fulfill international standards while adhering to Indian laws and regulations.^[8] In India’s expanding healthcare industry, this harmonization promotes uniformity in procedures and improves the accuracy of diagnostic findings. Despite advancements, there are still issues with integrating ISO 15189 with regional regulatory frameworks. The standards and regulations of various nations may occasionally conflict with or overlap with ISO 15189.^[13] For instance, laboratories in certain nations might have to adhere to local regulations that don’t fully align with ISO 15189, creating difficulties in meeting both local and international standards. The 2022 revision addresses this issue by offering greater implementation flexibility, allowing laboratories to demonstrate conformity based on outcomes rather than solely on prescriptive documentation.^[5]

Technological advancements

Technological advancements are enhancing the implementation of ISO 15189, resulting in more robust laboratory functionality. Routine procedures such as quality control, result reporting, and sample analysis are becoming more and more automated in laboratories, which ensures more dependable results by increasing accuracy and decreasing human error.^[1,14] In addition, the use of artificial intelligence (AI) has also started to monitor laboratory processes and predict potential errors, which ultimately enhances decision-making and helps laboratories comply with ISO 15189’s rigorous quality control requirements. Modern laboratory operations now depend heavily on laboratory information management systems (LIMSs), which enable laboratories to track samples from collection to reporting, ensuring that each step of the diagnostic process is traceable and documented.^[15] This enhances operational effectiveness, reduces error rates, and promotes adherence to ISO 15189 standards, particularly regarding documentation and traceability requirements. Furthermore, as technology has advanced, leading medical laboratories worldwide have effectively utilized LIMS to improve their compliance with ISO 15189.^[1] The 2022 revision places increased emphasis on information management, data security, and integrity, reflecting the growing digitalization of laboratory services.

Patient-centered strategies

In line with ISO 15189’s emphasis on patient safety, effective communication of laboratory results is vital to patient care. A major enhancement in ISO 15189:2022 is its explicit focus on patient-centered care, including consideration of patient needs, ethical practices, and communication strategies. Laboratories are encouraged to ensure that results are not only analytically correct but also clinically meaningful and accessible. Some laboratories have implemented patient-friendly reporting formats and digital platforms to improve transparency and patient engagement.^[7]

Risk-based approaches

ISO 15189 encourages laboratories to have a system in place to identify and manage risks. To identify potential risks to laboratory operations (such as human error, equipment failure, and sample contamination), laboratories employ techniques including failure mode and effects analysis and root cause analysis.^[1] To minimize risks, several mitigation strategies may be employed, such as regular equipment calibration, retraining personnel, or implementing redundant systems. Further, by implementing a risk-based approach in alignment with ISO15189, laboratories can proactively identify potential issues and mitigate them before they affect patient care.^[16] Unlike the more prescriptive approach of ISO 15189:2012, the 2022 revision allows laboratories to design risk management processes tailored to their specific context. All these implementations and processes within the laboratory operations foster a culture of continuous improvement, which aligns with the basic principle of ISO 15189, thereby improving the quality, accuracy, and reliability of test results and ultimately leading to better patient satisfaction. Unlike the more prescriptive approach of ISO 15189:2012, the 2022 revision allows laboratories to design risk management processes tailored to their specific context.

Challenges and limitations

Even though ISO 15189 offers medical laboratories numerous advantages, there are certain challenges in implementing this standard. Resource constraints, resistance to change, evolving standards, and regional variations are all issues laboratories must address. While ISO 15189:2022 introduces flexibility and outcome-based compliance, laboratories still require substantial investment in infrastructure, training, and leadership commitment. However, overcoming these obstacles offers laboratories an opportunity to enhance patient safety, improve overall quality, and support international efforts to improve healthcare outcomes. Laboratories can advance toward fulfilling ISO 15189 compliance and improve diagnostic services globally by recognizing these obstacles and creating plans to overcome them.^[13]

Opportunities and future directions

ISO 15189 may remain a pillar of quality assurance in medical laboratories worldwide by embracing digital transformation, increasing access in low-resource settings, encouraging international cooperation, and incorporating sustainability and proactive risk management. The continuous progression of the standard and its patient-centric approach, along with its global adoption, will ensure that medical laboratories contribute to safer, more accurate, and timely patient diagnoses across all regions, regardless of resource availability. In addition to improving patient outcomes, laboratories that remain ahead of these developments will continue to have a competitive advantage in the rapidly evolving healthcare system. The 2022 revision encourages laboratories to adopt environmentally responsible practices and proactive risk management strategies.

Although ISO 15189 has been shown to be an effective tool for enhancing laboratory standards, there are still issues with its global implementation, especially in developing regions. To facilitate the implementation of ISO 15189, laboratories require funding, infrastructure development, and training. Furthermore, the standard must be continually reevaluated to maintain its relevance and effectiveness in enhancing patient care, given regional variations in accrediting procedures and developments in the healthcare system. Technological advancements such as AI, machine learning, and automation, which reduce human error and improve diagnosis, give laboratories the chance to meet ISO 15189 standards. Medical laboratories’ environmental effect can be further decreased by incorporating sustainable procedures and processing in accordance with ISO 15189. ISO 15189 will remain a vital standard for medical laboratory quality as healthcare demands around the world change. Healthcare leaders, laboratory managers, accreditation bodies, and policymakers must invest in the creation and ongoing development of ISO 15189-compliant laboratories to ensure their effectiveness and success. They can address the growing need for high-quality diagnostics and enhance patient outcomes globally by cultivating a culture of quality assurance and cooperation.