Metric Conversions, Giving The Correct Amount For Injection, Calculating Infusion Times, Solution Strength Worksheet With Answers Page 13
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22LDU Maths, Stats and Numeracy Support
Infusion Rate Calculations (drops/minute)
Example: A patient is to receive 1 Litre normal saline over the next 4 hours. What is
the infusion rate in drops per minute if the drop rate is 15?
Answer: First convert 1L to ml, which is 1000 ml, and then substitute into the
formula:
62.5
Remember to round your answer to the nearest whole number = 63 drops per
minute.
Try the following questions
1) Half a litre of fluid is to be given over 5 hours. What is the infusion rate in drops
per minute if the drop factor is 15?
2) A young woman is to be given 480 ml of metronidazole 500 mg over 4 hours. What
is the infusion rate in drop per minute if the drop factor is 20?
3) Over the next 15 hours a male patient is to receive 4 litres of dextrose 5%. What
is the infusion rate in drop per minute if the drop factor is 20?
4) A patient is to receive 500 ml of dextrose 5% over 2 hours. What is the infusion
rate in drops per minute if the drop factor is 20?
5) A female patient is to receive 2 litres of fluid over 10 hours. What is the infusion
rate in drops per minute if the drop factor is 15?
6) One unit of blood (500 ml) is to infuse over 4 hours. What is the flow rate if the
drop factor of the giving set is 15 drops/ml?
numeracy@mdx.ac.uk
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