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An IV of 500 mL needs to be infused over a period of 6 hours using a set calibrated at 10 gtt/mL. What is the flow rate in gtt/min?

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To calculate the flow rate in gtt/min, we first convert the volume of the IV (500 mL) into mL/hr by dividing it by the infusion time (6 hr). This gives us a rate of 83.3 mL/hr. Since the digit at the tenths place is less than 5, we round down to 83 mL/hr.

Next, we write the equation for the flow rate in terms of gtt/min. We set up a fraction with 10 gtt as the numerator and 1 mL as the denominator.

To convert mL/hr to gtt/min, we multiply this fraction by another fraction with 83 mL as the numerator and 60 min as the denominator.

Simplifying the equation, we find that the flow rate is 13.8 gtt/min. Since the digit at the tenths place is greater than 5, we round up to 14 gtt/min.