# IV Drip Rate Formula: Calculation Practice Quiz!

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Nicolette Natale, BA |
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Are you pursuing a nursing course? IV Drip-Rate Formula: Calculation Practice quiz is designed to test your knowledge. Here, you can see how efficiently you can do IV flow rate drip calculations. Flow rates are measured in mL/hr (milliliters per hour). Although most IV pumps automatically calculate this in the job setting, you always need to double-check the IV pump to ensure the right amount of drug is being infused. You can share the quiz with others who wish to practice the drip factor formula.

## Drop Factor Formula Questions and Answers

• 1.

### Ordered: 500 mg ampicillin in 100mL NS to infuse over 30 minutes. What is the flow rate per hour?

• A.

20 mL

• B.

50 mL

• C.

100 ml

• D.

200 mL

D. 200 mL
Explanation
To calculate the flow rate per hour, we need to use the following formula:
Flow rate (mL/hour) = Total volume (mL) / Time (hours)
Here's how to apply it to this situation:

Total volume: We have 100 mL of normal saline (NS) solution.
Time: The solution needs to be infused over 30 minutes, which is 30 minutes / 60 minutes/hour = 0.5 hours.

Now, plug these values into the formula:
Flow rate (mL/hour) = 100 mL / 0.5 hours = 200 mL/hour
Therefore, the flow rate per hour is 200 mL.
So, the correct answer is 200 mL.

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• 2.

### Ordered: 500 mL 5% Dextrose 0.45% NS over 3 hours. Find the flow rate per hour.

• A.

125 mL

• B.

167 mL

• C.

250 mL

• D.

500 mL

B. 167 mL
Explanation
Let's calculate the flow rate per hour for the given order:Total volume: We have 500 mL of the solution to infuse.Time: The solution needs to be infused over 3 hours.Now, using the formula:Flow rate (mL/hour) = Total volume (mL) / Time (hours)Flow rate = 500 mL / 3 hours = 166.67 mL/hour (rounded to two decimal places)Therefore, the flow rate per hour is 167 mL. So, the correct answer is 167 mL.

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• 3.

### Ordered: 1000 mL LR over 6 hours.  Find the flow rate in mL per hour.

• A.

17 mL

• B.

167 mL

• C.

175 mL

• D.

217 mL

B. 167 mL
Explanation
The correct flow rate for 1000 mL LR over 6 hours is 167 mL per hour. Here's the calculation:Total volume: We have 1000 mL of LR solution.Time: The solution needs to be infused over 6 hours.Now, applying the formula:Flow rate (mL/hour) = Total volume (mL) / Time (hours)Flow rate = 1000 mL / 6 hours = 166.67 mL/hour (rounded to two decimal places)Therefore, the flow rate is 167 mL per hour, matching option B.

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• 4.

### Find the flow rate in mL per hour. 300 mL NS over 2 H.

• A.

150 mL

• B.

200 mL

• C.

300 mL

• D.

600 Ml

A. 150 mL
Explanation
The flow rate for 300mL NS over 2 hours is 150 mL per hour.Here's the calculation:Total volume: We have 300 mL of NS solution.Time: The solution needs to be infused over 2 hours.Now, applying the formula:Flow rate (mL/hour) = Total volume (mL) / Time (hours)Flow rate = 300 mL / 2 hours = 150 mL/hourTherefore, the correct answer is 150 mL.

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• 5.

### Find the flow rate in mL per hour. 3000 mL 0.45% over 24 H.

• A.

75 mL

• B.

200 mL

• C.

125 mL

• D.

150 mL

C. 125 mL
Explanation
3000 mL / 24 H = 125 mL per hour

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• 6.

### Find the flow rate in mL per hour. 1500 mL RL over 12 hours.

• A.

83

• B.

94

• C.

100

• D.

125

D. 125
Explanation
To find the flow rate for 1500 mL RL over 12 hours, we need to use the formula:Flow rate (mL/hour) = Total volume (mL) / Time (hours)Total volume: We have 1500 mL of RL solution.Time: The solution needs to be infused over 12 hours.Now, plugging these values into the formula:Flow rate = 1500 mL / 12 hours = 125 mL/hourTherefore, the flow rate in mL per hour is 125. So, the correct answer is C. 125.Remember, accurate medication administration relies on precise calculations. Always be sure to double-check your work and ensure appropriate rounding.

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• 7.

### Find the flow rate in mL per hour. 40 mEq KCL in 100 mL NS over 45 minutes.

• A.

66 mL

• B.

75 mL

• C.

125 mL

• D.

133 mL

D. 133 mL
Explanation
To calculate the flow rate in milliliters per hour (mL/h) for an IV infusion, you can use the following formula:
Flow Rate (mL/h) = (Volume to Infuse in mL) / Time in hours
Given: Volume to infuse = 100 mL
Time = 45 minutes, 1 hour = 60 minutes, so 45 minutes = 45/60 hours = 0.75 hours
Flow Rate = 100 mL / 0.75 hours = 133.33 mL/h
So, the flow rate for the IV infusion of 40 mEq of KCl in 100 mL of NS over 45 minutes is approximately 133.33 milliliters per hour.

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• 8.

### Find the flow rate in mL per hour. 1000 mL NS over 12 hours.

• A.

83

• B.

94

• C.

100

• D.

125

A. 83
Explanation
The flow rate for 1000 mL of Normal Saline (NS) over 12 hours is 83 mL per hour. Here's the calculation:Total volume: We have 1000 mL of NS solution.Time: The solution needs to be infused over 12 hours.Using the formula:Flow rate (mL/hour) = Total volume (mL) / Time (hours)Flow rate = 1000 mL / 12 hours = 83.33 mL/hour (rounded to two decimal places)Therefore, the correct answer is A. 83.

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• 9.

### Find the flow rate in mL per hour. 20 mEq KCL in 50 mL NS over 30 minutes.

• A.

94

• B.

100

• C.

125

• D.

83

B. 100
Explanation
The flow rate can be calculated by dividing the volume of the solution (50 mL) by the time it takes to infuse (30 minutes). The flow rate in mL per hour can be obtained by multiplying the result by 60 (to convert minutes to hours). Therefore, the flow rate in mL per hour for this solution is 100.

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• 10.

### Find the flow rate in mL per hour. 750 mL NS over 8 hours.

• A.

83

• B.

93.75

• C.

100

• D.

125

B. 93.75
Explanation
The flow rate is 93.75 mL per hour.Here's how we can calculate it:Convert the total volume to mL/hour: We know the total volume is 750 mL and the infusion time is 8 hours. To find the hourly rate, we simply divide the volume by the time: 750 mL / 8 hours = 93.75 mL/hour.Therefore, the correct answer is 93.75.

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• 11.

### Calculate the flow rate for manually regulated IV using the drops per minute. Ordered: 1000 mL NS over 24 hours. Tubing is 20 gtt/mL. Write the number only of the drops per minute.

13.89, 14
Explanation
To calculate the flow rate for an intravenous (IV) infusion using drops per minute (gtts/min), you can use the following formula:
Flow Rate (gtts/min) = (Volume to Infuse in gtts) / Time in minutes
Given: Volume to infuse = 1000 mL
Time = 24 hours = 24 * 60 minutes = 1440 minutes
Tubing factor = 20 gtt/mL
Flow Rate = (1000 mL * 20 gtt/mL) / 1440 minutes
Flow Rate ≈ 13.89 gtts/min
So, the flow rate for the manually regulated IV infusion is approximately 13.89 drops per minute.

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• 12.

### Calculate the flow rate for manually regulated IV using the drops per minute. Ordered: 250 mL D5W over 3 hours. Tubing is 10 gtt/mL. Write the number only of the drops per minute.

14
Explanation
The flow rate for manually regulated IV is calculated by dividing the total volume (250 mL) by the total time (3 hours), and then converting the result to drops per minute using the tubing's drop factor (10 gtt/mL). In this case, the calculation would be: (250 mL / 3 hours) x (10 gtt/mL) = 833.33 gtt/hour. To convert this to drops per minute, divide by 60 minutes: 833.33 gtt/hour / 60 minutes = 13.89 gtt/minute. Rounding to the nearest whole number, the answer is 14.

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• 13.

### Calculate the flow rate for manually regulated IV using the drops per minute. Ordered: 40 mEq KCL in 100 mL NS over 40 minutes. Tubing is 20 gtt/mL. Write the number only of the drops per minute.

50
Explanation
Flow rate (gtt/min) = (Volume to be infused in mL / Time in minutes) x Drop factor (gtt/mL)
In this case, you have the following information:
Volume to be infused (VTBI): 100 mL
Time in minutes: 40 minutes
Drop factor: 20 gtt/mL
Now, plug these values into the formula:
Flow rate (gtt/min) = (100 mL / 40 minutes) x 20 gtt/mL
Flow rate (gtt/min) = (2.5 mL/min) x 20 gtt/mL
Flow rate (gtt/min) = 50 gtt/min
So, the flow rate for this manually regulated IV is 50 drops per minute.

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• 14.

### Calculate the flow rate for manually regulated IV using the drops per minute. Ordered: 1500 mL 0.45% NS over 12 hours. Tubing is 15 gtt/mL. Write the number only of the drops per minute.

31
Explanation
The flow rate for manually regulated IV can be calculated by dividing the total volume of the solution (1500 mL) by the total time (12 hours), and then multiplying it by the drop factor (15 gtt/mL). This will give us the total number of drops required for the entire infusion. Dividing this number by the total time (12 hours) will give us the number of drops per minute. In this case, the correct answer is 31 drops per minute.

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• 15.

### Calculate the flow rate for manually regulated IV using the drops per minute. Ordered: 500 mL NS over 8 hours. Tubing is 15 gtt/mL. Write the number only of the drops per minute.

16
Explanation
The flow rate for manually regulated IV can be calculated by dividing the total volume of fluid (500 mL) by the total time (8 hours), and then multiplying by the drop factor (15 gtt/mL). This will give the number of drops per hour. To calculate the drops per minute, we divide the drops per hour by 60 (minutes in an hour). Therefore, the correct answer is 16 drops per minute.

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Nicolette Natale |BA |
Medical Expert
Nicolette is an accomplished physician, research coordinator, and medical writer, boasting over 6 years of expertise in healthcare, research, psychology, and education. Her qualifications include a D.O. from Nova Southeastern University and B.A. degrees in English Literature and Psychology from the University of Miami. Nicolette is deeply involved in medical research and patient care, demonstrating a commitment to advancing the field of medicine.

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• Mar 05, 2024
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Expert Reviewed by
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• Jan 19, 2012
Quiz Created by
Marie Fox

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