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Question 1
Infuse 2 litres over 8 hours. What is the flow rate in mL/h?
Correct Answer:
250 mL/h
Explanation:
Flow rate is the amount of fluid delivered per unit time. To find it in mL per hour, convert the volume to millilitres and divide by the time in hours. 2 litres equals 2000 millilitres, and over 8 hours that’s 2000 ÷ 8 = 250 mL/h. So the infusion rate is 250 millilitres per hour. If you kept litres, you’d get 0.25 L/h, which is the same as 250 mL/h since 1 L = 1000 mL.
Question 2
The nurse must infuse 800 mg over 6 hours. The solution is 100 mg per 5 mL. How many mL per hour?
Correct Answer:
6.67 mL/hr
Explanation:
To find the infusion rate, first convert the dose to the volume of fluid using the solution’s concentration, then divide by the infusion time. The solution has 100 mg in 5 mL, which is 20 mg per mL. To deliver 800 mg, you need 800 mg ÷ 20 mg/mL = 40 mL. Infusing 40 mL over 6 hours means the rate is 40 mL ÷ 6 h ≈ 6.67 mL per hour (about 6.7 mL/hr).
Question 3
Calculate the rate for 1.5 L Lactated Ringers to be given over 12 hours with tubing that delivers 25 gtt/mL. What is the rate in gtt/min?
Correct Answer:
52 gtt/min
Explanation:
To find the rate in gtt/min, multiply the volume in mL by the drip factor (gtt/mL) and divide by the infusion time in minutes. Convert 1.5 L to 1500 mL and 12 hours to 720 minutes. With a drip factor of 25 gtt/mL, the total drops are 1500 × 25 = 37,500 drops. Over 720 minutes, that’s 37,500 ÷ 720 ≈ 52.1 gtt/min, which rounds to 52 gtt/min. This matches the given option.
Question 4
The patient needs 0.1 mcg/kg/min of a drug. The patient weighs 40 kg. If the drug solution is 2 mg/mL, what is the mL/min?
Correct Answer:
0.002 mL/min
Explanation:
To set an infusion rate from a weight-based dose, first convert the desired dose into a rate in micrograms per minute, then use the drug's concentration to convert that into milliliters per minute. The patient needs 0.1 mcg/kg/min for 40 kg, so the dose rate is 0.1 × 40 = 4 mcg/min. The drug solution is 2 mg/mL, which is 2000 mcg/mL. The infusion rate in mL per minute is 4 mcg/min ÷ 2000 mcg/mL = 0.002 mL/min.
Question 5
A drug order is 1000 mg to be given over 6 hours. The solution concentration is 500 mg per 5 mL. What is the infusion rate in mL/hr?
Correct Answer:
1.67 mL/hr
Explanation:
Start with the idea that you convert the prescribed dose to the actual volume using the solution’s concentration, then divide that volume by the time to get the infusion rate in mL per hour. The concentration is 500 mg in 5 mL, which is 100 mg per mL. To deliver 1000 mg, you need 1000 mg ÷ 100 mg/mL = 10 mL total. Infusing 10 mL over 6 hours gives a rate of 10 mL ÷ 6 h = 1.667 mL/h, about 1.67 mL/hr. So the infusion rate is 1.67 mL/hr.
Question 1
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About this Exam

Prepare with the Infusion Calculations Practice Test practice quiz. This question bank includes 10 questions covering hours, rate, patient, drug, and solution. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Infusion Calculations Practice Test

This practice set contains 10 questions from the matching question bank and focuses on hours, rate, patient, drug, and solution. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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