Let's use an example similar to the one on the last page : The patient is prescribed: 720ml of mixture over 6 hours720mL ÷ 6 Hrs = 120mL/Hrdetermine how much per Minute. 120mL/Hr ÷ 60(min/Hr) = 2mL/minWe arrived at 2mL/minThe Infusion set device delivers 10 gtt/ml,Now, simply take the amount of ml/min and multiply it by the gtt/ml.2ml/min x 10gtt/ml = 20gtt/minThis example seemed very easy, right? Well, it really is just that easy. The only things that makes it more complicated are fractions, decimals and rounding up to the nearest drop. As long as you keep gtt/ml and gtt/min straight the rest is just math. Would you rather watch a video? Here's one - Video Tutorial Another flow rate calculation example
The patients weight is irrelevant. The 250ml IV is just saline and used as a vehicle to carry the active drug into the patient's body. Angel is in pharmacy tech school and I know she knows some math. So.... First you need to convert your mg's to mcg's.Next, using
proportions math
you can determine how many mL's are needed to deliver 5mcg's.Here is how it will look:
You now know that 0.05 ml contains 5mcgThe patient needs 5mcg/min, so they need 0.05 ml/min 0.05 ml x 60 min = 3ml/HourThe Answer is 3ml/HourFlow rate calculations tutorialBy Zita Schmitt, CPhT> Where would you like to go now? Back to Math Homepage
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