What is the minimum hourly urine output that indicates adequate renal perfusion in shock management?

• A. 10 mL/hr
• B. 20 mL/hr
• C. 30 mL/hr
• D. 50 mL/hr

Answer: (C)

The main idea here is that urine output serves as a practical indicator of renal perfusion during shock. A common target is about 0.5 mL per kilogram per hour, which for many adults translates to roughly 30 mL per hour. This threshold reflects enough flow to sustain glomerular filtration and prevent acute kidney injury as perfusion is restored. Values as low as 10 or 20 mL/hr indicate significant underperfusion, while 50 mL/hr exceeds the minimum needed and suggests better renal perfusion. In practice, monitor hourly and consider factors that can affect urine output, such as diuretics, obstruction, or chronic kidney disease, while addressing the underlying shock to improve overall perfusion.