Questions and Answers
What is the flow rate in mL per hour for 1,500 mL of normal saline to be infused over 7 hours?
214 mL/hour
What is the drops per minute when infusing 1,500 mL of normal saline over 7 hours with a drop factor of 15 drops/mL?
54 drops/minute
How many drops per minute should be the flow rate for 1,200 mL of 0.45% normal saline infused at 125 mL/hour with a drop factor of 12 drops/mL?
25 drops/minute
What is the flow rate in drops per minute for 250 mL of D5W to be infused over 2 hours and 45 minutes with a drop factor of 60 drops/mL?
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What is the flow rate in mL per hour for 250 mL of platelets to be infused over 2 hours and 30 minutes?
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How many drops per minute should the flow rate be for 250 mL of platelets infused over 2 hours and 30 minutes with a drop factor of 10 drops/mL?
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What is the flow rate in mL per hour for 1 and 1/4 liters of D5LRS to be infused over 18 hours?
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Study Notes
IV Flow Rate Calculations
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For a prescription of 1,500 mL of normal saline over 7 hours:
- Flow rate: 214 mL/hour
- Drops per minute: 54 drops/minute
- Calculation: 1,500 mL ÷ 7 hours = 214.3 mL/hour; 1,500 mL ÷ 420 minutes = 3.57 mL/min x 15 drops/mL = 53.55 drops/minute
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For a prescription of 1,200 mL of 0.45% normal saline at 125 mL/hour:
- Drops per minute: 25 drops/minute
- Calculation: Infusion time: 1,200 mL ÷ 125 mL/hour = 9.6 hours; 9.6 hours x 60 = 576 minutes; Total drops: 1,200 mL x 12 drops/mL = 14,400 drops ÷ 576 minutes = 25 drops/minute
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For a patient receiving 250 mL of D5W over 2 hours and 45 minutes:
- Drops per minute: 91 drops/minute
- mL per hour: 91 mL/hour
- Total infusion time in minutes: 165 minutes (2 hours = 120 minutes, plus 45 minutes); Total drops: 250 mL x 60 drops/mL = 15,000 drops ÷ 165 minutes = 90.90 drops/minute
- Time duration: 2 hours and 45 minutes added to 15:00 starts at 17:45
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For a prescription of 250 mL of platelets over 2 hours and 30 minutes:
- Flow rate: 100 mL/hour
- Drops per minute: 17 drops/minute
- Total infusion time in hours: 2.5 hours; Calculation: 250 mL ÷ 2.5 hours = 100 mL/hour
- Total infusion time in minutes: 150 minutes; 250 mL ÷ 150 minutes = 1.66 mL/minute; Total drops: 1.66 mL/min x 10 drops/mL = 16.66 drops/minute, rounded to 17 drops/minute
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For a prescription of 1.25 liters of D5LRS over 18 hours:
- Calculation pending for flow rate in mL/hour.
- Drop factor: 20 drops/mL will be used for further calculations.
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Test your knowledge on IV flow rate calculations with these flashcards. Learn to convert infusion volumes and rates effectively using the IV flow rate formula. This quiz is ideal for nursing students and healthcare professionals.
