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A woman in pre-term labor is ordered 2g IV Magnesium Sulfate dissolved un 100 ml of...

A woman in pre-term labor is ordered 2g IV Magnesium Sulfate dissolved un 100 ml of NS. The magnesium sulfate is supplied in 4g/10ml vials. How many ml of magnesium sulfate does the nurse add to the 100 ml bag of NS.

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Answer #1

Prescribed order of magnesium sulfate = 2g IV in 100 ml NS

Available dose of magnesium sulfate = 4g/10 ml

ml of magnesium sulfate to be added to 100 ml NS =( Prescribed dose \div Available dose ) x Volume of available dose

= (2g \div 4g ) x 10 ml

= 5 ml

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