Monitoring intake and output is critical for several reasons. It helps in: 1. Assessing Fluid Balance: Ensuring proper hydration and identifying imbalances that could lead to conditions like dehydration or overhydration. 2. Evaluating Kidney Function: Adequate urine output is an indicator of kidney function, which is vital for excreting waste products. 3. Guiding Treatment Plans: Helps in tailoring fluid therapy and medication dosages, especially in patients with conditions like heart failure, renal disease, or those undergoing surgery. 4. Detecting Complications Early: Early signs of fluid imbalance can be detected through meticulous I&O monitoring, preventing severe complications.