## Regarding IV flow rates

by Jim
(Toledo, Ohio)

A Microdrip IV has been set to drop 10 gtt/min. The bag contains 450mg of a particular drug in a total of 1000ml. How many mg of the drug will the patient receive per hour if the set is calibrated to deliver 60 gtt/mL?
A. 4.5mg
B. 270mg
C. 2.7grams
D. None of the above

Thank you!
Jim

____________________________________

Jim, I'm answering this on my phone from a Starbucks hot-spot, so I didn't write it down. Hope it's correct. Here's what I think:

600 drops in 1/Hour
----------------------------
60 drops per/mL

= 10mL/Hour

450mg - - - 4.5mg
------- = --------
1000ml - - - 10ml

Someone else, please hit comment below and show the work on this one. Thanks.

## Comments for Regarding IV flow rates

 Apr 12, 2011 How I did this problem... by: Rob We know that:10gtt-----1 min.So, lets figure out how many drops are in 60 minutes.10gtt - X gtt----- = -----1 min.- 60 minX = 600gtt (in 60 minutes)We also know that:60gtt-----1 mLSo, lets figure out how many mL are in 600gtt60gtt - 600gt----- = -----1 mL - X mLX = 10mL for every 600gttYou then know that:450mg-----1000mLSo just plug in 10mL to find out how many mg it will be450mg - X mg----- = -----1000mL- 10mLX = 4.5mg will be transferred to the patient-per hour.

 Apr 10, 2011 Willing to try it... by: Anonymous If this is wrong, please correct me! Thanks :).There are 450mg/1000mL, therefor 0.45mg/per mL in the bag of solution.Then we have calibration of 60gtts/mL, and it is set to drop 10gtts/min.So that tells me that I can get 60 gtts/6 minutes.And 60 gtts is equal to 1 ml, as stated in the calibration. 1 ml is also equal to 0.45mg in the solution bag. So...if...60gtts = 1mL = 0.45mg Then,0.45mg / 6 minutes = ? mg / 60 minutesSolve for the ? and I get 4.5 mg.Am I right?

 Apr 09, 2011 Regarding IV flow Rates by: Jim Thank you Keith. Nowhere in my Pharm Tech study book is this problem covered.

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