The aim of this study is to develop an arm circumference measurement device that can be used by both patients and nurses in the follow-up of upper extremity lymphedema, which may occur as a result of breast cancer surgery, and to evaluate its usability. This study also seeks to determine whether the developed device can offer a more accurate, faster, and more practical alternative compared to traditional tape measurements. The main questions it aims to answer are: Is there a significant difference in intra-observer reliability between the measurements taken by nurses and patients using the arm circumference measurement device and those taken using a traditional tape measure? Is there a significant difference in inter-observer reliability between the measurements taken by nurses and patients using the arm circumference measurement device and those taken using a traditional tape measure? Is there a significant difference in the measurement results obtained by nurses and patients when using the arm circumference measurement device compared to a traditional tape measure? Do nurses and patients experience a difference in the duration of arm circumference measurements when using the measurement device versus a traditional tape measure? Is there a difference in the satisfaction levels of nurses and patients regarding arm circumference measurements performed with the measurement device versus a traditional tape measure? This study will be conducted in two phases: the first phase involves the development of the arm circumference measurement tool, and the second phase involves the evaluation of its usability through a double-blind, two-group, crossover randomized controlled trial.
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Intra-rater Reliability
Timeframe: Preoperative period (Same day, within 30 minutes between repeated measurements.) The same rater (nurse/patient/researcher) performs repeated measurements on the same arm with both methods within a short interval to assess consistency.
Inter-rater Reliability
Timeframe: Preoperative period (Same day, sequential measurements within 1 hour by different raters.) Measurements by different raters (nurse, patient, researcher) are conducted on the same day in a fixed sequence.