A solution has a ratio strength of 1:1,000. How much drug is present in 5 mL if the ratio means 1 g in 1,000 mL?
Correct answer: B. 5 mg
- A. 0.5 mg
- B. 5 mg
- C. 50 mg
- D. 500 mg
Explanation
One gram equals 1,000 mg, so 1 g in 1,000 mL equals 1 mg/mL. In 5 mL, the amount is 5 mL × 1 mg/mL = 5 mg. The ratio strength must first be expressed as milligrams 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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