What is considered normal urine output per hour?

Normal urine output is typically considered to be around 30 to 60 mL per hour for a healthy adult. This range reflects the kidneys' function in maintaining fluid balance and proper filtration, and is considered an important measure of renal performance.

The value of 40 mL/hr fits comfortably within this normal range, indicating adequate renal perfusion and effective functionality. It suggests that the kidneys are effectively filtering the blood and producing urine at a rate that is expected under normal physiological conditions. This amount is critical for maintaining the body's electrolyte balance, removing waste products, and ensuring proper hydration levels.

Values significantly below 30 mL/hr could indicate potential renal impairment or dehydration, while consistently high outputs might suggest issues like diabetes insipidus or a high fluid intake. Thus, 40 mL/hr represents a middle ground within the acceptable range for urine output, making it a reasonable and accurate answer.