An infant weighs 12 lbs. If the dose for a medication is 100 mg / kg, how many milligrams should the infant receive per dose?
362
424
540
780
540
Rationale: By using Fried's rule, to determine the infant's dose, convert pounds to kilograms: 1 kg = 2.2 lbs. Therefore, by using the ratio 2.2X = 12 lbs, this infant weighs 5.4 kg. Therefore, 100 mg --------- 1 kg = X mg ------- 5.4 = 540 mg/dose.
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