When administering an IV infusion over a period of hours, what critical piece of information must a nurse continuously monitor?

The correct choice revolves around the importance of monitoring fluid intake and output during an IV infusion. Continuous monitoring of fluid intake (the amount of IV fluid administered) and output (the amount of fluid excreted by the patient, such as urine) is essential to prevent complications such as fluid overload or dehydration. This monitoring helps the nurse assess the patient's status and response to the IV therapy, ensuring that the patient maintains proper hydration and electrolyte balance.

Understanding the patient's fluid balance is particularly critical when administering IV infusions, as certain patients may be at higher risk for fluid-related complications, such as those with heart or kidney issues. By focusing on intake and output, the nurse can adjust the infusion rate or monitor for any signs of complications, safeguarding the patient's well-being during treatment.