The prescriber orders 100 mg of methylprednisolone IV. The vial directs: add 2 mL of diluent to yield 100 mg/mL.
Ordered dose100 mg
After reconstitution100 mg/mL
Diluent2 mL
How many milliliters should the nurse draw up?
Answer: 1 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 2 mL diluent → 100 mg per 1 mL
2. Set up dimensional analysis so mg cancels
100 mg × ( 1 mL ÷ 100 mg )
3. Cancel mg and solve
= 100 ÷ 100 mL
= 1 mL
The prescriber orders 75 mg of cefazolin IV. The vial directs: add 2.5 mL of diluent to yield 50 mg/mL.
Ordered dose75 mg
After reconstitution50 mg/mL
Diluent2.5 mL
How many milliliters should the nurse draw up?
Answer: 1.5 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 2.5 mL diluent → 50 mg per 1 mL
2. Set up dimensional analysis so mg cancels
75 mg × ( 1 mL ÷ 50 mg )
3. Cancel mg and solve
= 75 ÷ 50 mL
= 1.5 mL
The prescriber orders 50 mg of ceftriaxone IV. The vial directs: add 10 mL of diluent to yield 50 mg/mL.
Ordered dose50 mg
After reconstitution50 mg/mL
Diluent10 mL
How many milliliters should the nurse draw up?
Answer: 1 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 10 mL diluent → 50 mg per 1 mL
2. Set up dimensional analysis so mg cancels
50 mg × ( 1 mL ÷ 50 mg )
3. Cancel mg and solve
= 50 ÷ 50 mL
= 1 mL