Math test help

[cvinson30]

I am trying to convert mg to ml. If I have Bicillin 1,200,000/2ml on hand and the doctor orders 900,00 units. I did 900,000 ÷1,200,000 =0.75 and then 0.75×2ml =1.5ml. Is this correct?

[meanmaryjean, DNP, RN]

I am trying to convert mg to ml. If I have Bicillin 1,200,000/2ml on hand and the doctor orders 900,00 units. I did 900,000 ÷1,200,000 =0.75 and then 0.75×2ml =1.5ml. Is this correct?

1.5 x 1,200,000 = 900,000

you are correct

[KelRN215, BSN, RN]

You went about it a different way than I would have but your answer is correct.

I would have divided 1,200,000/2 mL to get 600,000 units/mL. (I am assuming the dose in the millions is in units, not mg, because I've never seen a million mg of anything as a dose.) Then I would divide 900,000 units by 600,000 units/mL to get 1.5 mL.

[bjwojcik]

Hi,

If you do it like this you will never wonder if you did it correctly.

900,000 units (2 mL/1,200,000 units) = 1.5 mL

FYI, you should never have naked numbers running around without their units attached.

Brad Wojcik, PharmD

[bgxyrnf, MSN, RN]

FYI, you should never have naked numbers running around without their units attached.

This would eliminate a substantial percentage of errors.

I am trying to convert mg to ml

You really should strive to understand what the units represent in the physical sense. Mass (mg) plays no role in your problem.