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Discussion

Dosage Question

Hello! I am a nursiing student getting ready for a med matH test and doing practice questions.

I am having trouble with a med math question, that I feel should be easy, but it is getting me stuck. Do I use the 200 to calculate, or the 1000?

Order: 45% Isocal tube feeding, 200ml to run at 42 ml/hr

Available: Isocal 1000mL can

How many mL will the nurse use to make the above order?

mL Isocal__________ mL water__________

Thank you in advance!

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    • Solved by KrCmommy522

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    Basically since it says you have 1000 mL you will pour out 90 and mix with 110 for the total of 200 like you had posted.

    The way I learned it, you would pour out 100 mL of Isocal and replace that with 110 mL of water. That gives you 90 mL (45%) of Isocal and 110 mL (55%) of water - which is what you want 45% strength, which means need to dilute with 55% water.

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