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Homework Help: Need help with conversion of units

  1. Nov 11, 2014 #1
    1. The problem statement, all variables and given/known data
    Your patient weighs 70 kg the prescription states 0.5 mg/kg/hr. You have a bag of 250 mg in 50 mL. At what rate (mL/hr) will you set the pump?

    2. Relevant equations
    I don't think I have to convert the units of this equation, just cancel them out... but I'm not entirely sure.

    3. The attempt at a solution
    I tested it out, this is how i answered it
    0.5/mg/kg/hr X 70kg = 35mg/hr

    35 mg/hr X 50ml/250mg (I cancel out mg)
    = 7ml/hr

    I am not sure if I did this correctly.
  2. jcsd
  3. Nov 11, 2014 #2


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    Science Advisor
    Homework Helper
    2017 Award

    How many milligrams per hour does the whole of the patient need ?
    35 mg/hr is fine.
    you know 250 mg is 50 ml, so 35 mg /hr is 35/250 * 50 mg/hr * ml/mg
    You and patient can rest assured that this is correct.

    Welcome to PF :) (though this is more like artihmetic, isn't it ?)
  4. Nov 11, 2014 #3
    Thank You BvU. :)
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