Which of the following assessments is least beneficial in determining fluid status in a child with acute glomerulonephritis?

In the context of assessing fluid status in a child with acute glomerulonephritis, observing edema may not provide the most precise information compared to the other assessment methods. While edema can give some indications of fluid retention or overload, it is often a more subjective measurement and can be influenced by various factors such as age, individual response to illness, and other underlying conditions.

Daily weight measurements are a crucial tool for monitoring fluid status because they offer a direct quantitative measure of changes in body fluid. Similarly, measuring intake and output provides a clear picture of fluid balance by tracking what the child is consuming versus what is being excreted. Blood urea nitrogen levels can indicate kidney function and hydration status, further assisting in evaluating fluid management.

Hence, while observing edema is important as part of a broader clinical assessment, it is less objectively beneficial in determining precise fluid status compared with the other options, which provide more reliable and quantifiable data.