ISO/IEC 17025-Compliant Calibration of Biomedical Equipment: Frameworks, Methods, and Measurement Uncertainty Assessment

Abstract

Modern healthcare would not be possible without the use of biomedical equipment, which is crucial in supporting diagnosis, therapy, monitoring of patients, and life-sustaining processes. Clinical devices like ventilators, infusion pumps, defibrillators, patient monitors, ECG systems, thermometers, and laboratory instruments directly relate to the clinical decision-making and delivery of treatment. Thus, they necessitate regular calibration and frequent validation of these instruments to maintain reliability, safety, accuracy and consistent performance over the entire life of the instrument. Any inaccuracy in measuring or in performance of functions can result into wrong diagnosis, ineffective treatment or a greater risk to patient safety. The ISO/IEC 17025 standard of competence of testing and calibration laboratories offers a robust and internationally recognized framework of ensuring technically valid, traceable and reliable results of calibration [1]. It provides rules of lab competence, unbiasedness, traceability of measurements, validation of methods, qualification of personnel, control of the environment and quality management systems. By adhering to this standard, biomedical calibration labs are able to maintain high standards of technical accuracy, and to express a degree of confidence in their results. The paper provides a critical review of ISO/IEC 17025-conforming calibration practices of biomedical equipment, including quality system, metrological traceability, estimation of uncertainty, risk-based calibration timeframes, documentation control, personnel competence, and internal quality assurance. It also talks about calibration methodology of commonly used biomedical devices such as patient monitors, infusion pumps, defibrillators, electrosurgical units, ventilators, thermometers, sphygmomanometers, pulse oximeters, ECG systems, and weighing scales. Particular attention is paid to evaluation of the uncertainty of measurements, environmental factors, and rules to evaluate conformity. Moreover, the paper examines some of the major issues that healthcare facilities and labs in developing nations face, including the lack of strong chains of traceability, trained staff, regulatory control, and reliance on non-accredited service providers [2]. Lastly, practical recommendations are made to the hospitals, regulators and laboratories to have sustainable biomedical metrology systems in accordance with the ISO/IEC 17025 requirements. The paper concludes that systematic calibration within a certified structure is a significant intervention to improve patient safety, clinical confidence, regulatory compliance, operational efficiency, and overall healthcare outcomes.