need help with a math problem

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  • by mRpeNa
    Specializes in LTC.

can someone please help me with this problem...i got 4ml as the answer

A vial contains 2 GM of powder. After being reconstituted with 4cc saline, how many mls are needed to administer a 500mg dose?

thank you for your response!

cslxagRN

47 Posts

500mg * 1gm / 1000mg * 4ml/2gm = 1 ml

Daytonite, BSN, RN

1 Article; 14,603 Posts

Specializes in med/surg, telemetry, IV therapy, mgmt.

a vial contains 2 gm of powder. after being reconstituted with 4cc saline, how many mls are needed to administer a 500mg dose?

dose desired:
500 mg

dose on hand:
2 grams

conversion factor:
1 gram = 1000 mg

also, be aware that 1 cc = 1 ml

dose desired divided by dose on hand multiplied by any amount the dose on hand comes in gives you the quantity you will give.

500 mg
(dose desired)
/2 grams
(dose on hand)
x 4 ml
(amount the dose on hand comes in)
/1 x 1 gram/1000 mg
(conversion factor - to convert grams to mg)
=
1 ml
(amount you will give)

you will find weblinks to tutorials on post #2 of this sticky thread: https://allnurses.com/general-nursing-student/nursing-math-thread-264395.html - the nursing math thread

mRpeNa

218 Posts

Specializes in LTC.
a vial contains 2 gm of powder. after being reconstituted with 4cc saline, how many mls are needed to administer a 500mg dose?

dose desired:
500 mg

dose on hand:
2 grams

conversion factor:
1 gram = 1000 mg

also, be aware that 1 cc = 1 ml

dose desired divided by dose on hand multiplied by any amount the dose on hand comes in gives you the quantity you will give.

500 mg
(dose desired)
/2 grams
(dose on hand)
x 4 ml
(amount the dose on hand comes in)
/1 x 1 gram/1000 mg
(conversion factor - to convert grams to mg)
=
1 ml
(amount you will give)

you will find weblinks to tutorials on post #2 of this sticky thread: https://allnurses.com/general-nursing-student/nursing-math-thread-264395.html - the nursing math thread

thank you! i dont know why i have am having a hard time with this kind of math

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