The easiest formula for calculating drops per minute is volume in mL x drop

The easiest formula for calculating drops per minute

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The easiest formula for calculating drops per minute is: volume in mL x drop factor # of minutes Ex: Doctor’s order: Infuse 500 mL of NS IV over 4 hours. Drop factor: 15gtt/mL How many gtt/min will you regulate the IV? Formula: 500 mL (volume) x 15 (drop factor) = 7500 = 31.25 = 31 gtt/min 4 hr x 60 minutes (must convert to minutes) 240 Notice that 31.25 is rounded to 31, the nearest whole number. This is a rounding rule that you must remember because drops cannot be administered in parts, only in whole drops. Ex: Doctor’s order: Infuse 1000 mL of D5W at 100 mL/hr. Drop factor: 10 gtt/mL How many gtt/min will you regulate the IV? Formula: 100 mL (volume) x 10 (drop factor) = 1000 = 16.666 = 17 gtt/min 1 hr x 60 minutes 60 Notice that when mL/hr is given in the problem, you use that as your total volume. Important point: When calculating gtt/min round to the nearest whole. Calculating Gtt/min for IVPB Medications There will also be times when you will need to use the gtt/min formula for intermittent intravenous medications often called piggybacks (IVPB). These IV medications will be in a certain volume of fluid and directions will be given to administer at a certain rate. You will use the formula in the same way.
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Remember the important parts of the formula. They are volume of fluid in mL, drop factor and minutes (time). volume in mL x drop factor # of minutes Ex: Doctor’s order: Cipro 2 g in 125 mL of NS IVPB over 30 minutes Drop factor: 15 gtt/mL How many gtt/min will you regulate the IVPB? Calculating mL/hr for Flow Rates on IV Infusion Pumps IV pumps can also deliver IV fluids based on how many mL/hr the IV fluid is ordered. Ex: Doctor’s order: IV fluid of Normal Saline (NS) to be given at a rate of 125 mL/hr. What rate would you set the pump?
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  • Summer '19
  • Nursing, ml, Intravenous therapy, Infusion pump, IV Infusion Pumps

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