Infusion Calculations Practice Test

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The patient needs 0.1 mcg/kg/min of a drug. The patient weighs 40 kg. If the drug solution is 2 mg/mL, what is the mL/min?

0.008 mL/min 0.002 mL/min 0.04 mL/min 0.12 mL/min

Correct Answer:

0.002 mL/min

Explanation:

To set an infusion rate from a weight-based dose, first convert the desired dose into a rate in micrograms per minute, then use the drug's concentration to convert that into milliliters per minute. The patient needs 0.1 mcg/kg/min for 40 kg, so the dose rate is 0.1 × 40 = 4 mcg/min. The drug solution is 2 mg/mL, which is 2000 mcg/mL. The infusion rate in mL per minute is 4 mcg/min ÷ 2000 mcg/mL = 0.002 mL/min.

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