In an infant with dehydration, which finding most strongly indicates reduced urine output?

In an infant with dehydration, which finding most strongly indicates reduced urine output?

• A. Moist mucous membranes
• B. Normal capillary refill
• C. Absent urine output
• D. Warm, flushed skin

Answer: (C)

In dehydration, kidney activity is a direct reflection of fluid status. When there isn’t enough circulating volume, the kidneys conserve fluid and urine production drops sharply. The most telling sign of this reduction is that there is no urine produced at all—absent urine output clearly indicates the kidneys are not generating urine, signaling significant dehydration and possible hypovolemia. Other signs can be less reliable. Moist mucous membranes can still appear present in milder dehydration, normal capillary refill may occur early or with partial dehydration, and warm, flushed skin points more to perfusion or temperature issues than to urine production. In practice, you’d confirm reduced output by noting a dry diaper or no wet diaper over several hours, which supports the assessment of low urine production.

In dehydration, kidney activity is a direct reflection of fluid status. When there isn’t enough circulating volume, the kidneys conserve fluid and urine production drops sharply. The most telling sign of this reduction is that there is no urine produced at all—absent urine output clearly indicates the kidneys are not generating urine, signaling significant dehydration and possible hypovolemia.

Other signs can be less reliable. Moist mucous membranes can still appear present in milder dehydration, normal capillary refill may occur early or with partial dehydration, and warm, flushed skin points more to perfusion or temperature issues than to urine production. In practice, you’d confirm reduced output by noting a dry diaper or no wet diaper over several hours, which supports the assessment of low urine production.