A vial contains 25,000 units of a medicine in 5 mL. The prescription is for 7,500 units. What volume should the nurse draw up?
Correct answer: C. 1.5 mL
- A. 0.75 mL
- B. 1 mL
- C. 1.5 mL
- D. 2.5 mL
Explanation
The concentration is 25,000 ÷ 5 = 5,000 units/mL. The required volume is 7,500 ÷ 5,000 = 1.5 mL. The prescribed units must be compared with the available units 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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