question about iv calculations

On the bonus quiz #2 question #10. Can you explain how to do that.


An IV Drip is ordered to run at 4 gtt/min. It contains 875 mg of a drug in a 250 ml solution. How many mg will the patient receive per hour if the infusion set is calibrated to deliver 12 gtt/ml?


a. 0.70mg/hr


b. 16mg/hr


c. 70mg/hr


d. 160mg/hr






Reply
(by Keith)


The way I would do it is to first write down the factors.

Then I want to know how many drips will drop in one hour.

4gtt/min X 60 Min. = 240 gtt/hour


Next, I want to know how many ml that is.

Since each 12 gtt's adds up to 1 ml, I divide my total gtt / per hour by how many equal one 1 ml.

240 gtt/hr ÷ 12 gtt / ml = 20


That means that
20ml will drop each hour


Now, I want to know how many mg of the drug is in
20 ml.


So, take the known concentration and bounce 20 ml off of that to find out your answer. (
proportion math)


875mg                  X
  ------        =      -----

250ml             20ml


Click here to post comments.

Join in and write your own page! It's easy to do. How?
Simply click here to return to Pharmacy math questions
.






privacy
Share
Popular Pages
Additional Info