Clinical Performance of a Point-of-Care Creatinine Testing System in Individuals With Kidney Disease

This clinical performance study is designed to evaluate the accuracy and usability of the Creatinine Monitoring System under controlled conditions. Prior to study initiation, the investigational device, comparator device, and associated instruments will be verified to ensure calibration and proper function. All study personnel will undergo training on the protocol, informed consent procedures, and case report form (CRF) completion, and a kick-off meeting will be held to clarify roles and responsibilities. Participants will be enrolled strictly according to the predefined inclusion and exclusion criteria. Each subject will be assigned blinded identification numbers, including subject numbers, tester numbers, and venous blood sample numbers, to minimize bias. Venous blood will be collected for hematocrit testing and comparator analysis. Following blood collection, layperson participants will receive the complete investigational device package, including the instructions for use (IFU) and relevant labeling, and will perform self-testing without any prior training or assistance. Self-testing will take place in a separate room to avoid influence from previous participants. Disinfection of the handheld electrochemical meter will be performed using CLOROX HEALTHCARE Bleach Germicidal Wipes as specified in the user manual. After completing self-testing, layperson participants will assess the usability of the device by filling out a structured questionnaire, focusing on IFU readability and ease of use. In parallel, trained observers will complete an observer questionnaire to document any operational errors or deviations during the testing process. Once all testing is complete, results will be unblinded. Study data will be collected and verified by the clinical research associate (CRA) for completeness and accuracy of the CRFs. Statistical analyses will then be performed by qualified statisticians on the finalized dataset, and findings will be summarized in a clinical performance study report. Importantly, this study is observational in nature. The investigational and reference creatinine measurements are performed for research purposes only. Clinical diagnosis, treatment, and patient management are not affected by the investigational device results, and all medical care is provided according to routine clinical practice.