How is the flow rate in gtts/min calculated?

To calculate the flow rate in drops per minute (gtts/min), it is essential to know the total volume of fluid to be infused, the duration of the infusion in hours, and the drop factor, which is commonly referred to as "gtts."

The correct method involves dividing the total volume by the total infusion time represented in minutes, and then multiplying by the drop factor. Here's how it works:

1. Convert the infusion time from hours to minutes to ensure the units are consistent. Since there are 60 minutes in an hour, this conversion is necessary.

2. The formula begins with dividing the total volume by the time in minutes to assess how many milliliters (mL) will be infused per minute.

3. Next, multiplying by the drop factor (gtts) adjusts the flow rate to reflect the real number of drops that corresponds to the calculated milliliters per minute based on the specific IV drip set used.

Thus, the formula provided ensures that the final result gives the flow rate in drops per minute, making it the correct approach to calculate the flow rate for intravenous infusions. This method is consistent with standard practices in pharmacy and nursing for administering medications via IV.