What dose in mg should be given to a child weighing 55 lbs if the drug dose is 250 micrograms per kg of body weight?

To determine the correct dose in mg for a child weighing 55 lbs when the dosage is specified as 250 micrograms per kg, you first need to convert the child's weight from pounds to kilograms.

1. Convert weight: There are approximately 2.2 pounds in a kilogram. To convert 55 lbs to kg, divide by 2.2:

[

55 \text{ lbs} \div 2.2 \approx 25 \text{ kg}

]

2. Calculate the dose in micrograms: The dosage is 250 micrograms per kg. Multiply the child's weight in kg by the dosage:

[

250 \text{ mcg/kg} \times 25 \text{ kg} = 6250 \text{ mcg}

]

3. Convert micrograms to milligrams: Since there are 1000 micrograms in a milligram, convert 6250 mcg to mg:

[

6250 \text{ mcg} \div 1000 = 6.25 \text{ mg}

]

The correct answer reflects the accurate conversion and calculations performed step by step, leading to