Med-Math Dosage Calculations Practice Test 2026 - Free Dosage Calculations Practice Questions and Study Guide

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An IV set with 60 gtt/mL must infuse at 25 gtt/min. What is the rate in mL/hr?

15 mL/hr

30 mL/hr

50 mL/hr

25 mL/hr

Key idea: convert the drip rate from drops per minute to milliliters per hour using the drop factor.

With 60 drops per milliliter, 25 drops per minute equals 25/60 milliliters each minute. That's 0.4167 mL/min. To get per hour, multiply by 60 minutes: 0.4167 × 60 = 25 mL/hr. Using the direct formula: mL/hr = gtt/min × 60 / (gtt per mL) → 25 × 60 / 60 = 25.

So the infusion rate is 25 mL per hour.

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