The ratio strength of an injection is 1:1,000. Which concentration does this represent?
Correct answer: B. 1 mg/mL
- A. 0.1 mg/mL
- B. 1 mg/mL
- C. 10 mg/mL
- D. 100 mg/mL
Explanation
A 1:1,000 ratio means 1 g in 1,000 mL. Converting 1 g to 1,000 mg gives 1,000 mg ÷ 1,000 mL = 1 mg/mL. The ratio does not mean 1 mg in 1,000 mL.
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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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