An IV prescription requires 1,000 mL of fluid to run over 8 hours using tubing with a drop factor of 15 drops/mL. What rate should the nurse set in drops per minute?
Correct answer: B. 31 drops/min
- A. 24 drops/min
- B. 31 drops/min
- C. 38 drops/min
- D. 45 drops/min
Explanation
Use: volume × drop factor ÷ time in minutes. 1,000 × 15 ÷ 480 minutes = 31.25 drops/minute, which is rounded to 31 drops/minute. Gravity IV rates are rounded to a whole drop because partial drops cannot be delivered.
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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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