Metric Conversions, Giving The Correct Amount For Injection, Calculating Infusion Times, Solution Strength Worksheet With Answers Page 15
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22LDU Maths, Stats and Numeracy Support
Calculating Infusion Times
To calculate the time an infusion will run for, use the following formula:
Example:
A patient is given 2 litres of Saline at a rate of 125 ml/hour. How long (hours) will the
infusion last for?
Answer:
=
=
= 16 hours
Try the following questions
1) 800 ml of blood is to be given to a patient at the rate of 160 ml per hour. How long
will the infusion last?
2) Half a Litre of solution is given at a rate of 125ml/hour. How long will the infusion
last for?
3)1 Litre of solution is running at a rate of 80 ml/hour. How long will the infusion last
for? Give your answer in hours and minutes
4) A patient receives 200 ml of fluid at a rate of 400 ml/hour. What is the duration of
the infusion?
5) An infusion of 1200 ml Dextrose 5% is started at 10 am. When will the infusion
finish if it is running at a rate of 100 ml/hour? Give your answer using the 24 hour
clock.
6) 4 litres of 0.9% normal saline is administered at a rate of 400ml/hour. After 5
hours the rate is changed to 250 ml/hour.
a) How many hours will the infusion run for at the new rate?
b) What was the total running time for the infusion?
numeracy@mdx.ac.uk
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