Examples · Reconstitution
Worked example
Reconstitution - practice problem 11
The prescriber orders 1000 mg of ceftriaxone IV. A 1 g vial directs: add 9.6 mL of diluent to yield 100 mg/mL.
Ordered dose1000 mg
Vial1 g
Diluent9.6 mL
After reconstitution100 mg/mL
How many milliliters should the nurse draw up?
Answer: 10 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 9.6 mL diluent → 100 mg per 1 mL
2. Set up dimensional analysis so mg cancels
1000 mg × ( 1 mL ÷ 100 mg )
3. Cancel mg and solve
= 1000 ÷ 100 mL
= 10 mL
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