CCBMA Math and Dosage Calculations Practice Test

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A dose calls for 0.5 mg/kg; the patient weighs 44.4 kg. What is the correct dose?

4.44 mg

222 mg

22.2 mg

The key idea is that the total dose in milligrams equals the dose per kilogram times the patient’s weight in kilograms. So multiply 0.5 mg/kg by 44.4 kg. 44.4 × 0.5 equals 22.2, giving 22.2 mg. The units work out because mg/kg × kg = mg, so you’re converting the per-kilogram dose into a total amount for this patient. This aligns with the expected scale: about 22 mg for a patient weighing around 44 kg at a half-milligram-per-kilogram dose.

11.1 mg

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