Which volume would provide a 3 mg dose?

Which volume would provide a 3 mg dose?

• A. 0.1 mL
• B. 0.5 mL
• C. 1 mL
• D. 0.2 mL

Answer: (D)

To figure out the volume that delivers a specific dose, use volume = dose ÷ concentration. You need to know how many milligrams are in each milliliter of the solution. If the solution is 15 mg per mL, a 3 mg dose requires 3 ÷ 15 = 0.2 mL. So 0.2 mL gives exactly 3 mg. At the same concentration, 0.1 mL would give 1.5 mg, 0.5 mL would give 7.5 mg, and 1 mL would give 15 mg, which shows why 0.2 mL is the correct volume for a 3 mg dose.

To figure out the volume that delivers a specific dose, use volume = dose ÷ concentration. You need to know how many milligrams are in each milliliter of the solution. If the solution is 15 mg per mL, a 3 mg dose requires 3 ÷ 15 = 0.2 mL. So 0.2 mL gives exactly 3 mg. At the same concentration, 0.1 mL would give 1.5 mg, 0.5 mL would give 7.5 mg, and 1 mL would give 15 mg, which shows why 0.2 mL is the correct volume for a 3 mg dose.