What information should be recorded in intake and output (I&O) and why is accuracy important?

• A. All intake (oral, IV, meds) and all outputs (urine, stool, drains) in milliliters; accuracy guides hydration status and kidney function.
• B. Only oral fluids and urine output; accuracy helps with nutrition planning.
• C. Only IV fluids and stool output; accuracy is optional.
• D. Intake and outputs are estimates; precision is not important.

Answer: (A)

Tracking fluid balance through intake and output is essential in nursing care. All fluid intake—oral fluids, IV fluids, and any fluids given with medications or nutrition—should be recorded in milliliters. All fluid outputs—urine, stool, emesis, drains, and other losses—also in milliliters. Recording every source consistently provides an accurate picture of hydration status and kidney function. When intake and output are balanced, fluid needs are being met and kidneys are handling the volume properly. If intake exceeds output, there is potential fluid overload and risks to the heart and lungs; if output exceeds intake, there could be dehydration or excessive losses. Accurate I&O guides decisions about fluid therapy, electrolyte management, and overall patient safety. Using milliliters ensures precise tracking, which is especially important in detecting small but clinically significant changes. Regular monitoring and documentation support timely interventions and help prevent complications.