This study aims to evaluate the effectiveness of a mobile health application developed for adult patients undergoing hemodialysis treatment. The mobile application includes modules on adherence to medication, diet, and fluid restrictions, symptom management (fatigue, pain, itching), nutrition guidance, exercise recommendations, and motivational content. It also features reminder notifications, an "Ask the Expert" module, and personal symptom tracking.

The research will be conducted as a single-center, single-blind, randomized controlled experimental study. Participants will be assigned to intervention and control groups using block randomization. The intervention group will receive the mobile application, while the control group will receive standard care. Assessments will be carried out at baseline (T0), 1st month (T1), and 2nd month (T2).

The measurement tools to be used include the End-Stage Renal Disease Adherence Questionnaire (ESRD-AQ), Post-Dialysis Fatigue Scale, 5-D Itch Scale, Visual Analog Scale (VAS) for pain, and the Mobile Application Usability Scale. In addition, clinical parameters such as serum potassium, phosphorus, and albumin will be evaluated.

A total of 72 patients (36 intervention, 36 control) will be included in the study. This study aims to assess the impact of a mobile health application on treatment adherence, symptom management, and clinical parameters among hemodialysis patients, and to develop a digital health model that can be integrated into nursing care.

Chronic kidney disease is a major global public health problem, and most patients with end-stage renal disease (ESRD) depend on hemodialysis to survive. Patients undergoing hemodialysis often experience difficulties with treatment adherence, challenges related to dietary and fluid restrictions, as well as common symptoms such as fatigue, pain, and itching. These problems negatively affect their quality of life. Previous studies have reported that more than half of hemodialysis patients demonstrate poor treatment adherence, which is associated with increased mortality. Therefore, innovative and technology-based approaches are needed to improve adherence and reduce symptom burden.

In recent years, mobile health (mHealth) applications have been increasingly used in the management of chronic diseases. Such applications enable patients to monitor their health more closely, improve medication and dietary adherence, and receive support for symptom management. However, most existing studies in the literature have focused on only one dimension of adherence (such as medication or diet) and have not comprehensively evaluated symptom management together with biochemical parameters.

This study aims to investigate the effect of a newly developed mobile health application, created by the research team, on treatment adherence, symptom management (fatigue, pain, itching), and clinical parameters (serum potassium, phosphorus, albumin) among hemodialysis patients. The study will be conducted as a single-center, single-blind, randomized controlled trial including a total of 72 patients (36 intervention, 36 control). Participants will be assigned to groups using block randomization. The intervention group will receive the mobile application, while the control group will continue with standard care.

The mobile application has been specifically designed and developed by the research team to meet the needs of hemodialysis patients. It consists of modules on treatment adherence (medication, diet, fluid restriction, dialysis attendance), symptom management (fatigue, itching, pain), nutrition guidance, exercise recommendations, reminder notifications, a question-answer section with experts, and personal monitoring. The aim is to improve patients' self-care abilities and reduce their symptom burden.

Data will be collected at baseline (T0), 1st month (T1), and 2nd month (T2). Measurement tools include the End-Stage Renal Disease Adherence Questionnaire (ESRD-AQ), Post-Dialysis Fatigue Scale, 5-D Itch Scale, Visual Analog Scale (VAS) for pain, and the Mobile Application Usability Scale. In addition, laboratory parameters such as serum potassium, phosphorus, and albumin will be evaluated.

At the end of the study, scientific evidence will be obtained regarding whether the mobile health application developed by the research team is effective in improving treatment adherence, alleviating symptoms, and enhancing clinical outcomes in hemodialysis patients. The findings are expected to provide a model for integrating digital health applications into nursing care and to contribute to the healthcare system.

Inclusion Criteria:

• Age ≥ 18 years.
• Diagnosed with end-stage renal disease (ESRD).
• Receiving maintenance hemodialysis treatment for at least 3 months.
• Able to use a smartphone and willing to install the mobile health application.
• Voluntarily agreeing to participate in the study and providing written informed consent.

Exclusion Criteria:

• Patients with cognitive impairment, severe psychiatric disorders, or communication barriers that may interfere with participation.
• Patients with visual or hearing impairments that prevent the use of the mobile application.
• Patients who have undergone kidney transplantation or are scheduled for transplantation within the study period.
• Patients with serious comorbid conditions requiring hospitalization (e.g., advanced cancer, severe heart failure).
• Participation in another interventional clinical trial within the past 3 months.

Individual participant data (IPD) will not be shared because this study is a doctoral thesis project, and data use is restricted to the research team in accordance with ethics committee approval.

No additional parties are masked other than the outcomes assessor.