PCC Field Medical Training Battalion – West (FMTB-W) Practice Test

Drip rate is the number of drops that flow per minute, so it’s measured in drops per minute (gtt/min). The IV drop factor from the tubing determines how many drops make up a milliliter, and you use that to convert volume over time into a drip rate. For example, if you need to infuse 100 mL in 60 minutes with a tubing that delivers 20 gtt per mL, the drip rate is (100 mL × 20 gtt/mL) ÷ 60 min ≈ 33 gtt/min. That’s why drip rate is expressed in gtt/min rather than mL/hr or other units.

The other options don’t fit because mL/hr is volume per time (a flow rate but not the “drip rate” in drops per minute), BPM is beats per minute and not relevant to IV administration, and units/hr isn’t a standard unit for IV drip rate.