Archer Pharmacology – Dosage Calculation and Medication Administration Practice Test

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Which of the following best represents the rate for 400 mL over 8 hours with a drop factor of 20 gtt/mL?

17 gtt/min

Infusion rate calculations convert volume over time into drops per minute by using the drop factor to translate milliliters into drops.

First turn the total time into minutes: 8 hours is 480 minutes. The volume rate in milliliters per minute is 400 mL / 480 min ≈ 0.833 mL/min.

Now convert to drops per minute using the drop factor: 0.833 mL/min × 20 gtt/mL ≈ 16.7 gtt/min. Since you typically round to whole drops, this is about 17 gtt/min.

So the rate is approximately 17 gtt/min.

13 gtt/min

20 gtt/min

27 gtt/min

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