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Questions and Answers
Calculate the IV flow rate in gtt/min for the administration of 1000 mL D5LR to infuse in 8 hr with a drop factor of 20 gtt/mL.
Calculate the IV flow rate in gtt/min for the administration of 1000 mL D5LR to infuse in 8 hr with a drop factor of 20 gtt/mL.
42 gtt/min
Calculate the IV flow rate in gtt/min for the administration of 1000 mL LR to infuse in 10 hr with a drop factor of 20 gtt/mL.
Calculate the IV flow rate in gtt/min for the administration of 1000 mL LR to infuse in 10 hr with a drop factor of 20 gtt/mL.
33 gtt/min
Calculate the IV flow rate in gtt/min for a unit of packed cells (250 mL) to infuse in 4 hr with a drop factor of 20 gtt/mL.
Calculate the IV flow rate in gtt/min for a unit of packed cells (250 mL) to infuse in 4 hr with a drop factor of 20 gtt/mL.
21 gtt/min
Calculate the IV flow rate in gtt/min for 2L D5LR infusing at 150 mL/hr with a drop factor of 15 gtt/mL.
Calculate the IV flow rate in gtt/min for 2L D5LR infusing at 150 mL/hr with a drop factor of 15 gtt/mL.
Calculate the IV flow rate in gtt/min for infusing 3000 mL D5W in 20 hr with a drop factor of 20 gtt/mL.
Calculate the IV flow rate in gtt/min for infusing 3000 mL D5W in 20 hr with a drop factor of 20 gtt/mL.
Recalculate the IV flow rate in gtt/min for 600 mL remaining of D5W to be infused over 4 hr at a drop factor of 20 gtt/mL.
Recalculate the IV flow rate in gtt/min for 600 mL remaining of D5W to be infused over 4 hr at a drop factor of 20 gtt/mL.
How long will it take for the IV infusing at 20 gtt/min with a drop factor of 10 gtt/mL to complete when administering 1000 mL of D5W?
How long will it take for the IV infusing at 20 gtt/min with a drop factor of 10 gtt/mL to complete when administering 1000 mL of D5W?
How many mL of fluid will a client receive in 8 hr if the IV is set at 25 gtt/min with a drop factor of 15 gtt/mL?
How many mL of fluid will a client receive in 8 hr if the IV is set at 25 gtt/min with a drop factor of 15 gtt/mL?
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Study Notes
IV Flow Rate Calculations
- IV flow rate calculations determine the rate of fluid delivery in drops per minute (gtt/min).
- The formula for calculating gtt/min:
- gtt/min = (drop factor in gtt/mL) × (total volume in mL) / (infusion time in hr × 60 min/hr).
Examples of Calculations
-
1000 mL D5LR in 8 hours, drop factor 20 gtt/mL
- Flow rate: 42 gtt/min
- Calculation:
- 20 gtt/mL × 1000 mL / (8 hr × 60 min) = 42 gtt/min.
-
1000 mL LR in 10 hours, drop factor 20 gtt/mL
- Flow rate: 33 gtt/min
- Calculation:
- 20 gtt/mL × 1000 mL / (10 hr × 60 min) = 33 gtt/min.
-
250 mL of packed cells in 4 hours, drop factor 20 gtt/mL
- Flow rate: 21 gtt/min
- Calculation:
- 20 gtt/mL × 250 mL / (4 hr × 60 min) = 21 gtt/min.
-
2L D5LR at 150 mL/hr, drop factor 15 gtt/mL
- Flow rate: 38 gtt/min
- Calculation:
- 15 gtt/mL × 150 mL/hr / 60 min = 38 gtt/min.
-
3000 mL D5W in 20 hours, drop factor 20 gtt/mL
- Flow rate: 50 gtt/min
- Calculation:
- 20 gtt/mL × 3000 mL / (20 hr × 60 min) = 50 gtt/min.
Adjusting Flow Rate
- Infusing 1000 mL D5W over 8 hours with only 400 mL infused after 4 hours
- Remaining volume: 600 mL
- Remaining time: 4 hours
- New flow rate: 50 gtt/min
- Calculation:
- 20 gtt/mL × 600 mL / (4 hr × 60 min) = 50 gtt/min.
Duration of Infusion
- 1000 mL D5W infusing at 20 gtt/min, drop factor 10 gtt/mL
- Time to infuse: 8 hours and 20 minutes
- Calculation:
- Total drops: 1000 mL × 10 gtt/mL = 10000 gtt
- Time: 10000 gtt / (20 gtt/min) = 500 min, which converts to 8 hr 20 min.
Total Volume Calculation
- IV at 25 gtt/min, drop factor 15 gtt/mL over 8 hours
- Fluid received: 800 mL
- Calculation:
- 25 gtt/min × 60 min/hr × 8 hr = 12000 gtt
- Volume: 12000 gtt / 15 gtt/mL = 800 mL.
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