A child is hospitalized after a serious motor vehicle crash and has developed increased urination. What action by the nurse takes priority?

The correct answer is D: Monitor the child's intake and output. This action is a priority because increased urination may indicate a potential issue with fluid balance, such as diabetes insipidus or renal dysfunction. Monitoring intake and output will provide crucial information on the child's fluid status. Restricting dietary sodium intake (choice A) is not the immediate priority as it does not address the underlying cause of increased urination. Assessing daily serum sodium level (choice B) is important but not the initial step in managing increased urination. Weighing the child daily (choice C) can be helpful but does not provide real-time information on fluid balance like intake and output monitoring does.