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A maintenance dose of 3% hypertonic saline after a 250 mL bolus is prescribed. If the maintenance rate is 50 mL/hour and the tubing has a drip factor of 15 gtt/mL, what is the drip rate in gtt/min?

12 gtt/min

13 gtt/min

To find the drip rate in drops per minute, convert the maintenance flow from mL/hour to drops per minute using the drop factor. Multiply the maintenance rate by the drip factor: 50 mL/hour × 15 gtt/mL = 750 gtt/hour. Then convert to minutes: 750 gtt/hour ÷ 60 minutes/hour = 12.5 gtt/min. Since we can’t deliver half a drop, round to the nearest whole drop, giving 13 gtt/min. The 250 mL bolus doesn’t affect this ongoing maintenance rate calculation; it’s broader context but not part of the drip-rate math.

15 gtt/min

10 gtt/min

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