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HESI A2 IV Drip Ratio & Proportion Mastery: gtt/min,
mL/hr, Titration & Pediatric Calculations
Table of Contents
Subtopic 1: Basic Ratio Applications in IV Drip Calculations ............................................ 2
Subtopic 2: Advanced Ratio & Proportion in Drop Factor Calculations (gtt/min) ............... 10
Subtopic 3: Pediatric IV Drip Calculations Using Ratios and Body Surface Area (BSA) ....... 27
Subtopic 4: Calculations for IV Medication Mixing and Titration ...................................... 38
Subtopic 5: IV Flow Rate Adjustments Based on Patient Condition ................................. 47
Subtopic 6: Converting IV Rates Between Units (mL/hr, gtt/min, mcg/kg/min, etc.)........... 56
Subtopic 7: Weight-Based IV Drip Calculations and Pediatric Considerations.................. 66
Subtopic 8: IV Push Dose and Concentration Calculations ............................................. 75
Subtopic 9: Titration and Incremental Adjustment of Drip Rates ..................................... 84
Subtopic 10: Troubleshooting and Clinical Decision-Making in IV Drip Adjustments ......... 94
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Subtopic 1: Basic Ratio Applications in IV Drip
Calculations
Question 1:
A physician orders 500 mL of normal saline to be infused over 4 hours. What is the IV flow
rate in mL/hr?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 175 mL/hr
Correct Answer: B. 125 mL/hr
Rationale:
Flow rate (mL/hr) = Total volume (mL) ÷ Time (hr) = 500 ÷ 4 = 125 mL/hr.
Question 2:
An order is given to administer 1,000 mL of D5W over 8 hours. What is the IV rate in mL/hr?
A. 100 mL/hr
B. 115 mL/hr
C. 125 mL/hr
D. 150 mL/hr
Correct Answer: C. 125 mL/hr
Rationale:
1,000 ÷ 8 = 125 mL/hr.
Question 3:
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An IV bag contains 1,000 mL to be infused at 100 mL/hr. How long will the infusion take?
A. 8 hours
B. 10 hours
C. 12 hours
D. 6 hours
Correct Answer: B. 10 hours
Rationale:
Time = Volume ÷ Rate = 1,000 ÷ 100 = 10 hours.
Question 4:
A nurse must infuse 250 mL over 2 hours. What is the rate in mL/hr?
A. 125 mL/hr
B. 100 mL/hr
C. 130 mL/hr
D. 120 mL/hr
Correct Answer: A. 125 mL/hr
Rationale:
250 ÷ 2 = 125 mL/hr.
Question 5:
Infuse 1,200 mL over 6 hours. What is the IV rate in mL/hr?
A. 180 mL/hr
B. 190 mL/hr
C. 200 mL/hr
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D. 210 mL/hr
Correct Answer: C. 200 mL/hr
Rationale:
1,200 ÷ 6 = 200 mL/hr.
Question 6:
An order is given to infuse 500 mL at 50 mL/hr. How many hours will it take to complete?
A. 8 hours
B. 10 hours
C. 12 hours
D. 14 hours
Correct Answer: C. 12 hours
Rationale:
500 ÷ 50 = 10 hours.
Question 7:
The provider prescribes 750 mL over 5 hours. What is the infusion rate?
A. 150 mL/hr
B. 125 mL/hr
C. 145 mL/hr
D. 135 mL/hr
Correct Answer: A. 150 mL/hr
Rationale:
HESI A2 IV Drip Ratio & Proportion Mastery: gtt/min,
mL/hr, Titration & Pediatric Calculations
Table of Contents
Subtopic 1: Basic Ratio Applications in IV Drip Calculations ............................................ 2
Subtopic 2: Advanced Ratio & Proportion in Drop Factor Calculations (gtt/min) ............... 10
Subtopic 3: Pediatric IV Drip Calculations Using Ratios and Body Surface Area (BSA) ....... 27
Subtopic 4: Calculations for IV Medication Mixing and Titration ...................................... 38
Subtopic 5: IV Flow Rate Adjustments Based on Patient Condition ................................. 47
Subtopic 6: Converting IV Rates Between Units (mL/hr, gtt/min, mcg/kg/min, etc.)........... 56
Subtopic 7: Weight-Based IV Drip Calculations and Pediatric Considerations.................. 66
Subtopic 8: IV Push Dose and Concentration Calculations ............................................. 75
Subtopic 9: Titration and Incremental Adjustment of Drip Rates ..................................... 84
Subtopic 10: Troubleshooting and Clinical Decision-Making in IV Drip Adjustments ......... 94
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Subtopic 1: Basic Ratio Applications in IV Drip
Calculations
Question 1:
A physician orders 500 mL of normal saline to be infused over 4 hours. What is the IV flow
rate in mL/hr?
A. 100 mL/hr
B. 125 mL/hr
C. 150 mL/hr
D. 175 mL/hr
Correct Answer: B. 125 mL/hr
Rationale:
Flow rate (mL/hr) = Total volume (mL) ÷ Time (hr) = 500 ÷ 4 = 125 mL/hr.
Question 2:
An order is given to administer 1,000 mL of D5W over 8 hours. What is the IV rate in mL/hr?
A. 100 mL/hr
B. 115 mL/hr
C. 125 mL/hr
D. 150 mL/hr
Correct Answer: C. 125 mL/hr
Rationale:
1,000 ÷ 8 = 125 mL/hr.
Question 3:
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An IV bag contains 1,000 mL to be infused at 100 mL/hr. How long will the infusion take?
A. 8 hours
B. 10 hours
C. 12 hours
D. 6 hours
Correct Answer: B. 10 hours
Rationale:
Time = Volume ÷ Rate = 1,000 ÷ 100 = 10 hours.
Question 4:
A nurse must infuse 250 mL over 2 hours. What is the rate in mL/hr?
A. 125 mL/hr
B. 100 mL/hr
C. 130 mL/hr
D. 120 mL/hr
Correct Answer: A. 125 mL/hr
Rationale:
250 ÷ 2 = 125 mL/hr.
Question 5:
Infuse 1,200 mL over 6 hours. What is the IV rate in mL/hr?
A. 180 mL/hr
B. 190 mL/hr
C. 200 mL/hr
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D. 210 mL/hr
Correct Answer: C. 200 mL/hr
Rationale:
1,200 ÷ 6 = 200 mL/hr.
Question 6:
An order is given to infuse 500 mL at 50 mL/hr. How many hours will it take to complete?
A. 8 hours
B. 10 hours
C. 12 hours
D. 14 hours
Correct Answer: C. 12 hours
Rationale:
500 ÷ 50 = 10 hours.
Question 7:
The provider prescribes 750 mL over 5 hours. What is the infusion rate?
A. 150 mL/hr
B. 125 mL/hr
C. 145 mL/hr
D. 135 mL/hr
Correct Answer: A. 150 mL/hr
Rationale:
