Examples · Reconstitution
Worked example
Reconstitution - practice problem 11
The prescriber orders 2000 mg of ceftriaxone IV. The vial directs: add 2.4 mL of diluent to yield 250 mg/mL.
Ordered dose2000 mg
After reconstitution250 mg/mL
Diluent2.4 mL
How many milliliters should the nurse draw up?
Answer: 8 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 2.4 mL diluent → 250 mg per 1 mL
2. Set up dimensional analysis so mg cancels
2000 mg × ( 1 mL ÷ 250 mg )
3. Cancel mg and solve
= 2000 ÷ 250 mL
= 8 mL
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