An IV prescription requires 840 mL of fluid to run over 7 hours using tubing with a drop factor of 20 drops/mL. What rate should the nurse set in drops per minute?
Correct answer: C. 40 drops per minute
- A. 30 drops per minute
- B. 35 drops per minute
- C. 40 drops per minute
- D. 45 drops per minute
Explanation
Use: drops per minute = volume × drop factor ÷ time in minutes. The calculation is 840 × 20 ÷ 420 minutes = 40 drops per minute. Hours must be converted to minutes before calculating the gravity flow 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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