The prescription is for 90 mg and the vial concentration is 30 mg per ml. What volume should be prepared?

Question

TheoryPractice · Accepted Answer

3 ml. 90 mg ÷ 30 mg/ml = 3 ml, delivering precisely the prescribed dose.

Why the other options are incorrect:
• 2 ml: 2 ml at 30 mg/ml gives only 60 mg — 30 mg short of what is required.
• 4 ml: 4 ml delivers 120 mg, which is 30 mg more than the 90 mg ordered.
• 5 ml: 5 ml would give 150 mg — 60 mg above the prescribed amount.
• 6 ml: 6 ml contains 180 mg, which is double the required 90 mg.

The prescription is for 90 mg and the vial concentration is 30 mg per ml. What volume should be prepared?

Related questions

Free practice here. Timed mocks when you are ready.