Which abbreviation is used for a unit of mass in medication dosing?

• A. Mg
• B. g
• C. mL
• D. L

Answer: (A)

Mass for medication dosing is expressed in milligrams. The abbreviation milligram, written as mg, is used because dosing often involves very small quantities that are more precise than grams. One milligram equals one-thousandth of a gram, which allows accurate dosing for potent medicines. The other options aren’t used for mass in dosing: mL and L measure volume (not mass), and a gram is a larger unit that wouldn’t allow the same precision for typical drug doses.