American Association of Critical-Care Nurses (AACN) Certification Practice Test

What is the minimum urine output required per hour for adequate renal function?

1. 15 mL/hour

2. 30 mL/hour

3. 45 mL/hour

4. 60 mL/hour

The correct answer is: 30 mL/hour

The minimum urine output required per hour for adequate renal function is commonly accepted to be around 30 mL/hour. This value serves as a benchmark indicating that the kidneys are effectively filtering blood and maintaining fluid and electrolyte balance within the body. A urine output of 30 mL/hour correlates with a healthy glomerular filtration rate, demonstrating effective renal perfusion and function. Outputs below this threshold may suggest potential issues such as dehydration, acute kidney injury, or other underlying medical problems necessitating further evaluation or intervention. While other figures may appear in discussions about urine output, the consensus among healthcare providers emphasizes the 30 mL/hour mark as the lower limit for adequate renal function. This makes it an essential reference point for clinicians in monitoring patients' kidney health.