A nurse is assessing a client diagnosed with chronic renal disease for fluid volume excess. The nurse should recognize that which of the following provides a reliable measure of fluid retention?

A. Tissue edema: While edema suggests fluid accumulation, it can be subjective and vary with factors like positioning or underlying vascular issues. It is not the most precise or consistent indicator of total fluid status. B. Urinary output: Clients with chronic renal disease often have reduced or inconsistent urine output. This limits the reliability of urinary volume as a sole indicator of fluid retention in this population. C. Daily weight: Monitoring daily weight is the most accurate and sensitive method for detecting fluid retention. A consistent increase in weight reflects fluid accumulation even before visible symptoms appear. D. Sodium level: Serum sodium may not accurately reflect fluid volume status, especially in renal disease, where sodium handling is impaired and levels can fluctuate due to dilution or retention.