Final answer:
For the toddler, the minimal normal urine output is generally 1 ml/kg/hour. The 4-year-old's urine output of 46 ml/kg/day appears normal, while the preschooler's output of 9 ml/kg/day is likely insufficient and may suggest an issue such as dehydration or renal disease.
Step-by-step explanation:
To determine the normal range of urine output per day for a toddler weighing 13.9Kg, we can consider the average urine production of about 1.5 liters per day for adults and adjust for the toddler's weight. However, specific values for toddlers are not provided in the reference information. Generally, a urine output of 1ml/kg/hour is considered the minimal normal for children.
For the 4-year-old who had a 24-hour urine output of 820ml and weighs 18Kg, we calculate the urine output in ml/kg/day as follows:
(820ml ÷ 18Kg) = 45.56 ml/kg/day, which we round off to 46 ml/kg/day. This amount falls within the expected range, assuming a minimum normal urine output of 1ml/kg/hour, and therefore, is likely a normal urine output.
Regarding the preschooler weighing 16.5 kg who voids 150ml in 24 hours, we calculate the urine output similarly:
(150ml ÷ 16.5Kg) = 9.09 ml/kg/day, which we round off to 9 ml/kg/day. Given that this is much lower than expected, based on the minimum urine output of 1ml/kg/hour or 24ml/kg/day, this is likely an insufficient urine output and may indicate a problem such as dehydration or renal disease.