An order reads D5 0.45% NS 1000 mL over 8 hours. The IV set delivers 20 gtt/mL. What is the hourly drop rate in gtt/hour?

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Multiple Choice

An order reads D5 0.45% NS 1000 mL over 8 hours. The IV set delivers 20 gtt/mL. What is the hourly drop rate in gtt/hour?

Explanation:
To calculate IV flow rate, use the formula: drop rate in gtt per hour = (volume to be infused in mL × drop factor in gtt/mL) / time in hours. Here, 1000 mL over 8 hours means 1000 ÷ 8 = 125 mL per hour. With a drop factor of 20 gtt per mL, the hourly drops are 125 mL/hour × 20 gtt/mL = 2500 gtt/hour. So the correct rate is 2500 gtt/hour. (If you convert to drops per minute, that’s about 41.7 gtt/min.)

To calculate IV flow rate, use the formula: drop rate in gtt per hour = (volume to be infused in mL × drop factor in gtt/mL) / time in hours. Here, 1000 mL over 8 hours means 1000 ÷ 8 = 125 mL per hour. With a drop factor of 20 gtt per mL, the hourly drops are 125 mL/hour × 20 gtt/mL = 2500 gtt/hour. So the correct rate is 2500 gtt/hour. (If you convert to drops per minute, that’s about 41.7 gtt/min.)

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