Metric Conversions, Giving The Correct Amount For Injection, Calculating Infusion Times, Solution Strength Worksheet With Answers Page 21
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22LDU Maths, Stats and Numeracy Support
Solution Strength (mg/ml)
You need to know;
1 in 1000 = 1g in 1000ml
1 in 10 000 = 1 g in 10 000ml
Example 1: You have 2 solutions of Adrenaline: 1 in 1000 and 1 in 10 000
a) What is the concentration in mg/ml?
b) Which solution is the weakest?
Answer 1:
a) 1 g in 1000 ml = 1000 mg in 1000ml:
1 g in 10 000 ml = 1000mg in 10 000 ml:
b) The 1 in 10 000 solution is the weakest
Example 2: You have 20 mg of drug in 8 ml. What is the concentration in mg/ml?
Answer 2:
Try the following questions
1) 500 mg of amoxicillin powder is dissolved in 25 ml of water. What is the
concentration in mg/ml?
2) A syringe contains 20 mg of morphine in 4 ml. What is the concentration in mg/ml?
3) You have 1 gram of drug in 20 ml of fluid. What is the strength in mg/ml?
4) A patient requires 3 mg of Epinephrine by IM. You have the choice of a 1:1000 or a
1:10 000 solution.
a) Calculate how many ml is required for each solution.
b) Which solution is more suitable for injection?
5) Patient X requires 0.2 mg of 1 in 1000 Adrenaline. How many ml do you give?
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