What is standard adult urine output per hour?

• A. 1 mL/kg/hr; about 60–100 mL/hr
• B. Approximately 0.5 mL/kg/hr; about 30–50 mL/hr
• C. 2 mL/kg/hr; about 90–140 mL/hr
• D. 0.1 mL/kg/hr; about 5–15 mL/hr

Answer: (B)

Maintaining adequate urine output reflects true kidney perfusion and function. In adults, a typical rate is about 0.5 mL of urine per kilogram of body weight each hour. Translating that to a practical range, most adults should produce roughly 30–50 mL per hour. This is why this option fits best: it states the commonly used standard of 0.5 mL/kg/hr and the corresponding hourly volume of about 30–50 mL.

For example, a 60 kg person would be expected to produce around 30 mL/hr, and a 70 kg person about 35 mL/hr. The other options describe outputs that are either higher or lower than the usual range, which is why they don’t align with the standard expectation.