# need help with a math problem

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• by mRpeNa
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?

47 Posts

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

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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)

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)