After administering IV fluids to an infant, the diaper weighs 35 grams. How many milliliters of urine should be recorded?

After administering IV fluids to an infant, the diaper weighs 35 grams. How many milliliters of urine should be recorded?

• A. 25 mL
• B. 30 mL
• C. 35 mL
• D. 40 mL

Answer: (C)

Measuring urine output in infants is done by diaper weight, and urine has a density close to water, so 1 gram of urine roughly equals 1 milliliter. If the diaper after voiding weighs 35 grams, that corresponds to about 35 milliliters of urine, assuming you’ve accounted for the dry diaper weight. If you know the dry diaper’s weight, you would subtract it first (net urine volume = final weight − dry weight), but with the given information, recording 35 mL is appropriate.

Measuring urine output in infants is done by diaper weight, and urine has a density close to water, so 1 gram of urine roughly equals 1 milliliter. If the diaper after voiding weighs 35 grams, that corresponds to about 35 milliliters of urine, assuming you’ve accounted for the dry diaper weight. If you know the dry diaper’s weight, you would subtract it first (net urine volume = final weight − dry weight), but with the given information, recording 35 mL is appropriate.