Canadian Pharmacist Qualifying Exam Practice · Question
A patient requires an intravenous infusion of dextrose 10% in water (D10W) at a rate of 75 mL/hour. The IV tubing has a drop factor of 15 drops/min/mL. How many drops per minute should the nurse set the infusion rate?
To calculate drops per minute: (Volume in mL/hour ÷ 60 minutes/hour) × drop factor. So, (75 mL/hour ÷ 60 minutes/hour) × 15 drops/mL = 1.25 mL/minute × 15 drops
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Question: A patient requires an intravenous infusion of dextrose 10% in water (D10W) at a rate of 75 mL/hour. The IV tubing has a drop factor of 15 drops/min/mL. How many drops per minute should the nurse set the infusion rate?
Answer options:
- 15 drops/min ✅ 19 drops/min
- 23 drops/min
- 25 drops/min
Correct answer: 19 drops/min
Explanation: To calculate drops per minute: (Volume in mL/hour ÷ 60 minutes/hour) × drop factor. So, (75 mL/hour ÷ 60 minutes/hour) × 15 drops/mL = 1.25 mL/minute × 15 drops/mL = 18.75 drops/minute. Rounding to the nearest whole drop, the nurse should set the rate to 19 drops/minute.
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