CCBMA Math and Dosage Calculations Practice Test

Converting a prescribed dose to the volume to administer using the vial’s concentration is the key idea. You know you need 10 mg and the vial provides 5 mg in every 1 mL. The volume needed is Dose ÷ (Concentration) = 10 mg ÷ (5 mg/mL) = 2 mL. A quick check confirms the math: 2 mL × 5 mg/mL = 10 mg, which matches the ordered dose. The vial total is 10 mL, so drawing 2 mL leaves 8 mL in the vial, but that doesn’t affect the dose calculation.