A vial contains 2,000 units of a medicine in 4 mL. The prescription is for 650 units. What volume should the nurse withdraw?
Correct answer: C. 1.3 mL
- A. 0.65 mL
- B. 1.0 mL
- C. 1.3 mL
- D. 2.6 mL
Explanation
The concentration is 2,000 units ÷ 4 mL = 500 units/mL. The required volume is 650 units ÷ 500 units/mL = 1.3 mL. The common error is to confuse the prescribed units with the volume of the vial.
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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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