Calculating IV Flow Rate (gtt

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4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Calculating IV Flow Rate (gtt/min) Tetsuya Umebayashi, MSN, RN

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Gtt/min • To calculate the gtt/min rate, the following information will be necessary.  a. the tubing drop factor (macro drip or micro drip) or the number of gtt/mL (this number should be provided in each question)  b. the prescribed infusion rate in mL/hr

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Tubing drop factor (macro drip or micro drip) • Macro drip (Size of each drop is larger than micro drip) – 10 gtt/mL – 15 gtt/mL – 20 gtt/mL • Micro drip – 60 gtt/mL Red ones are the most common ones

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4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Sample Questions • 1000 mL of lactated Ringer’s is to infuse over 8 hr. The set calibration is 15 gtt/mL. How many gtt/min?

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Sample Questions (Cont) • You may already noticed a difference from the previous dimensional analysis questions. • This question has 2 different units of measure being calculated. • They are gtt and min

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Units of Measure Being Calculated Even though there are 2 values, the steps of calculation will be exact same as previous dimensional analysis calculations gtt min

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4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Step 1 • Begin with ratio contains gtt – 15 gtt /mL gtt min = 15 gtt mL Enter 15 gtt as the numerator (Top #) to match the gtt (unit of measure being calculated)

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Step 2 gtt min = 15 gtt mL x 1000 mL 8 hr The denominator (Bottom #) in the first ratio contains mL . To cancel it, the next numerator (Top #) must contain mL . We need to run 1000 mL fluid over 8 hrs, so enter 8 hr as denominator (bottom #)

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Step 3 gtt min = 15 gtt mL x 1000 mL 8 hr x 1 hr 60 min The denominator (Bottom #) in the second ratio contains hr . To cancel it, the next numerator (Top #) must contain hr . 1 hr = 60 min

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4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Step 4 gtt min = 15 gtt mL x 1000 mL 8 hr x 1 hr 60 min = 15 gtt x 1000 x 1 1 x 8 x 60 min = 15000 gtt 480 min = 31.25 gtt / min Not done yet

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Step 5 • IV problems expressed as drops per minute will be rounded to the whole number. (Example: 12.4 gtts/min is expressed 12 gtts/min & 12.8 gtts/min is expressed 13 gtts/min). • 31 gtt / min Many students tend to fail to follow this rule. Please be careful and always make sure to round to the whole number

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Practice Questions 1. A volume of 1500 mL is to infuse in 10 hours using a Micro drip. How many gtt/min will you set? 2. An IV of 500 mL is ordered to be infused in 12 hours using 15 gtt/mL set. How many gtt/min will you set? 3. An IV of 1000 mL is ordered to be infused at 150 mL/hr using 10 gtt/mL set. How many gtt/min will you set?

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4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Practice Questions 4. A 50 mL IVPB need to be infused over 15 minutes using 60 gtt/ml set. How many gtt/min will you set? 5. An IV of 1000 mL was scheduled to run over 10 hours. After 5 hr, only 350 mL have infused. The set calibration is 15 gtt/mL. Recalculate the rate for the remaining solution.

4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Practice Questions Answers 1. 150 gtt/min 2. 10 gtt/min 3. 25 gtt/min 4. 200 gtt/min 5. 33 gtt/min

Calculating IV Flow Rate (gtt

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