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Discussion

OB Math Calculations

A patient is being treated for eclampsia with Mag Sulfate ordered for anticonvulsant therapy. The order reads: Administer Mag Sulfate 4 g IV over 15-20 min. The concentration is 50% (1g/2mL). How many mLs would be administered? You have placed the dose in a 50mL bag for piggy back into the main line. What rate is your pump set at to deliver the medication in the time ordered?

Answer: So far I have - 8mL for the first question

x mL/4g : 2mL/1g

x=8mL

How do I solve the second part? the timing and the 50mL bag is confusing me. Does anyone know how to do this correctly?

Thank you.

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    How many mL will you need to administer, after preparing it for administration?

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    use the 15 min timing since it's easiest...

    15 min is how much of an hour? then calculate the rate to figure out how many mL/hr it would take to infuse the 50 mL in 15 min.

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