Which practice most accurately supports hydration assessment?

• A. Recording intake and output in milliliters, including all outputs.
• B. Estimating intake based on meals.
• C. Recording only urine output.
• D. Not recording intake at all.

Answer: (A)

Accurate hydration assessment relies on tracking fluid balance. The best practice is to document both intake and output in milliliters, including every source of intake (oral fluids, IV fluids, IV medications given as fluids, tube feeds) and every route of loss (urine, emesis, diarrhea, wound drainage, suction, gastric aspirate). Recording in milliliters provides precise data to compare what goes in with what leaves the body, helping to detect dehydration or fluid overload and to guide interventions. Relying on estimates from meals is unreliable because portions, fluid content, and appetite vary, and it misses other fluid sources. Recording only urine output gives an incomplete picture of balance, and not recording intake at all eliminates the ability to assess hydration. Maintaining complete intake and output data, often alongside daily weight and clinical signs, allows timely and appropriate fluid management.