During an IV infusion, the nurse counts 36 drops in 30 seconds. The giving set delivers 15 drops per millilitre. What is the approximate flow rate in millilitres per hour?
Correct answer: C. 288 mL/hour
- A. 180 mL/hour
- B. 216 mL/hour
- C. 288 mL/hour
- D. 360 mL/hour
Explanation
Thirty-six drops in 30 seconds equals 72 drops per minute. The rate is 72 ÷ 15 = 4.8 mL/minute, and 4.8 × 60 = 288 mL/hour. The counted drops must first be converted to a one-minute rate.
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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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