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A physician gives the following order: "Infuse LR, 500 mL over 2 hours."
At what rate should the nurse set the IV pump to deliver this infusion (mL/hr)?

A.

100 mL/hr

B.

250 mL/hr

C.

500 mL/hr

D.

1000 mL/hr

Answer and Explanation

The Correct Answer is B

To calculate the infusion rate in mL/hr, we need to divide the total volume to be infused by the time for infusion and convert the units appropriately.

First, we need to convert the time of infusion from hours to minutes, since most IV pumps use minutes as the time unit.

2 hours x 60 minutes/hour = 120 minutes Next, we can calculate the infusion rate:

500 mL ÷ 120 minutes = 4.17 mL/minute

To convert mL/minute to mL/hour, we multiply by 60:

4.17 mL/minute x 60 minutes/hour = 250 mL/hour

Therefore, the correct answer is B. 250 mL/hr. The nurse should set the IV pump to deliver the LR infusion at a rate of 250 mL/hr to infuse 500 mL over 2 hours.


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Related Questions

Correct Answer is A

Explanation

The Joint Commission has a list of approved medical abbreviations that should be used to prevent miscommunication and errors in healthcare settings.

Out of the abbreviations listed in the

Question , only "IV" (for intravenous) is on the Joint Commission's list of approved abbreviations.

"IU" (for international unit) is not on the list because it can be misinterpreted as "IV" (intravenous) or "10" (the Roman numeral for 10).

"QD" (for once daily) is also not on the list because it can be misinterpreted as "QID" (four times daily) or "QOD" (every other day).

"QOD" (for every other day) is also not on the list because it can be misinterpreted as "QD" (once daily) or "QID" (four times daily).

Therefore, the correct answer is A. IV.

Correct Answer is C

Explanation

To calculate the rate per hour, divide the amount of magnesium sulfate to be administered by the concentration of magnesium sulfate in the IV bag:

6 grams ÷ 40 grams = 0.15

Then, multiply the result by the volume of the IV bag, which is usually 1000 mL: 0.15 x 1000 mL = 150 mL

This is the amount of fluid that contains 6 grams of magnesium sulfate. To administer this amount over 30 minutes, multiply by 2 to get the rate per hour:

150 mL x 2 = 300 mL/hr.

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