A vial contains 1,200,000 units of a medicine in 3 mL. The prescription is for 800,000 units. What volume should the nurse withdraw?
Correct answer: C. 2 mL
- A. 1 mL
- B. 1.5 mL
- C. 2 mL
- D. 2.5 mL
Explanation
The vial contains 1,200,000 units ÷ 3 mL = 400,000 units/mL. Therefore, 800,000 units ÷ 400,000 units/mL = 2 mL. The prescribed units must be compared with the concentration per millilitre.
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About Drug Calculations and Dosage
Drug calculations apply measurement systems, unit conversions, dosage formulas, tablet and liquid doses, percentage and ratio strength, and weight based dosing. Work also includes calculating IV flow rates, infusion times and doses for children, while distinguishing the prescribed dose from the available concentration.
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