Ontario Registered Pharmacy Technician (RphT) Practice Exam

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An IV infusion order is written for 1L of D5W/0.45% NS to run over 12 hours. The set that will be used delivers 15gtt/mL. What is the flow rate in gtts/minute?

  1. 7

  2. 21

  3. 25

  4. 8

The correct answer is: 21

The formula for calculating flow rate is volume/time. In this scenario, the volume is 1L and the time is 12 hours, or 720 minutes. Using the set that delivers 15gtt/mL, we can convert the volume to mL by multiplying 1L by 1000 to get 1000mL. Then, we divide 1000mL by the set's drip rate of 15gtt/mL to get 66.67 minutes. Finally, to convert minutes to gtts/minute, we divide 60 minutes by 66.67 minutes and multiply it by 15gtt/mL to get a flow rate of 13.5 gtts/minute. Therefore, option B is the correct answer. Options A, C, and D are incorrect as they do not accurately represent the calculated flow rate. Option A is too low, option

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