A vial is reconstituted to a final volume of 5 mL and contains 1 g of drug. The prescription is for 600 mg. What volume should the nurse withdraw?
Correct answer: C. 3 mL
- A. 2 mL
- B. 2.5 mL
- C. 3 mL
- D. 4 mL
Explanation
The concentration is 1,000 mg ÷ 5 mL = 200 mg/mL. The required volume is 600 mg ÷ 200 mg/mL = 3 mL. Using the volume of diluent added instead of the final volume can produce an incorrect dose.
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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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