Math test help

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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 Ã·1,200,000 =0.75 and then 0.75Ã—2ml =1.5ml. Is this correct?

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Specializes in NICU, ICU, PICU, Academia. Has 46 years experience.
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 Ã·1,200,000 =0.75 and then 0.75Ã—2ml =1.5ml. Is this correct?

1.5 x 1,200,000 = 900,000

you are correct

1 Article; 7,349 Posts

Specializes in Pedi. Has 16 years experience.

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.

2 Articles; 127 Posts

Specializes in Pharmacy, Mathematics, Physics, and Educator. Has 30+ years experience.

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.

1,208 Posts

Specializes in Med-Tele; ED; ICU. Has 10 years experience.
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.
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