Intake and Output Monitoring

Intake and output (I&O) monitoring is a way to assess whether fluid entering the body is reasonably matched by fluid leaving it. It is not merely a charting exercise. The measured balance offers clues about circulating volume, kidney response, treatment effects, and developing complications. A client losing more fluid than they receive may develop reduced circulating volume and impaired tissue perfusion. The kidneys respond by conserving water, so urine output may fall. A client receiving more fluid than the body can distribute or excrete may develop oedema, crackles, increasing oxygen needs, or worsening shortness of breath. The same fluid balance number can therefore mean different things depending on the client's vital signs, examination findings, treatment, and baseline condition. Calculate the measured balance as: Total measured intake − total measured output = measured fluid balance This calculation is useful, but it is not a complete measure of total body water. Fever, rapid breathing, sweating, and other insensible losses may not appear on the record. A positive balance may be appropriate when a deficit is being treated; a negative balance may be...