How do you calculate fluid input and output?

To calculate fluid input, sum all fluids consumed within a specific time frame, including oral fluids, intravenous fluids, and any other sources. For fluid output, total all fluids lost from the body, such as urine, drainage, sweat, and respiration. It's essential to record these measurements accurately to assess hydration status and fluid balance. Regular monitoring can help detect any discrepancies that may require medical attention.