Postoperative autologous blood transfusion: a 500 mL unit to be infused over 4 hours. The giving set emits 20 drops/mL. What is the drip rate in gtt/min?

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Multiple Choice

Postoperative autologous blood transfusion: a 500 mL unit to be infused over 4 hours. The giving set emits 20 drops/mL. What is the drip rate in gtt/min?

Explanation:
When calculating drip rate in drops per minute, convert the total volume and time into compatible units and use the drop factor. First, convert 4 hours to minutes: 4 hours × 60 minutes/hour = 240 minutes. The rate in mL per minute is 500 mL ÷ 240 min ≈ 2.083 mL/min. With a giving set of 20 drops per mL, the rate in drops per minute is 2.083 mL/min × 20 drops/mL ≈ 41.7 drops/min. Rounding to the nearest whole drop gives 42 gtt/min.

When calculating drip rate in drops per minute, convert the total volume and time into compatible units and use the drop factor. First, convert 4 hours to minutes: 4 hours × 60 minutes/hour = 240 minutes. The rate in mL per minute is 500 mL ÷ 240 min ≈ 2.083 mL/min. With a giving set of 20 drops per mL, the rate in drops per minute is 2.083 mL/min × 20 drops/mL ≈ 41.7 drops/min. Rounding to the nearest whole drop gives 42 gtt/min.

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