A solution is labelled 2% w/v. How much drug does 1 mL of this solution contain?
Correct answer: C. 20 mg/mL
- A. 2 mg/mL
- B. 10 mg/mL
- C. 20 mg/mL
- D. 200 mg/mL
Explanation
A 2% w/v solution contains 2 g in 100 mL. Converting 2 g to 2,000 mg and dividing by 100 mL gives 20 mg/mL. Percentage strength must be converted before calculating the dose in milligrams.
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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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