A 60 kg patient requires an infusion at 0.15 mg/kg/hr. The drug concentration is 3 mg/mL. What is mL/hr?

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Multiple Choice

A 60 kg patient requires an infusion at 0.15 mg/kg/hr. The drug concentration is 3 mg/mL. What is mL/hr?

Explanation:
This question tests converting a weight-based dose to an infusion rate in milliliters per hour using the drug’s concentration. Start by finding the required dose per hour: 60 kg × 0.15 mg/kg/hr = 9 mg/hr. The concentration is 3 mg/mL, so the volume needed per hour is 9 mg/hr ÷ 3 mg/mL = 3 mL/hr. This delivers exactly 9 mg/hr since 3 mL/hr × 3 mg/mL = 9 mg/hr. Quick checks: 1 mL/hr would give 3 mg/hr, 6 mL/hr would give 18 mg/hr, and 9 mL/hr would give 27 mg/hr. Therefore, the infusion rate is 3 mL/hr.

This question tests converting a weight-based dose to an infusion rate in milliliters per hour using the drug’s concentration. Start by finding the required dose per hour: 60 kg × 0.15 mg/kg/hr = 9 mg/hr. The concentration is 3 mg/mL, so the volume needed per hour is 9 mg/hr ÷ 3 mg/mL = 3 mL/hr. This delivers exactly 9 mg/hr since 3 mL/hr × 3 mg/mL = 9 mg/hr. Quick checks: 1 mL/hr would give 3 mg/hr, 6 mL/hr would give 18 mg/hr, and 9 mL/hr would give 27 mg/hr. Therefore, the infusion rate is 3 mL/hr.

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