Metric Conversions, Giving The Correct Amount For Injection, Calculating Infusion Times, Solution Strength Worksheet With Answers Page 17
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22LDU Maths, Stats and Numeracy Support
Calculating Infusion Volumes
To calculate the volume given in an infusion, use the following formula:
Volume = Rate (ml/hour) x running time (hours)
Example:
A patient is given Saline for 16 hours at a rate of 125 ml/hour. How many Litres of
saline will the patient receive?
Answer:
16 x 125 = 2000ml = 2 Litres
Try the following questions
1) Blood is given to a patient at the rate of 160 ml per hour for 5 hours. How much
blood will the patient receive? Give your answer in ml.
2) Dextrose 5% solution is given at a rate of 125ml/hour. The infusion lasts for 4
hours. How much Dextrose solution will be infused?
3) Fluid is given at a rate of 80 ml/hour for 12 hours and 30 minutes. How many Litres
of fluid will have been infused at the end of the running time?
4) How much fluid is given in half an hour if it is running at a rate of 400 ml/hour?
5) An infusion of Dextrose 5% started at 10:00 and finished at 22:00. How many Litres
will have been given if it is running at a rate of 100 ml/hour?
6) 0.9% normal saline is administered at a rate of 400ml/hour for 5 hours after this
the rate is changed to 250 ml/hour for the next 8 hours. How many Litres will have
been given when the infusion finishes?
numeracy@mdx.ac.uk
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