IV dosage calculator

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IV dosage calculator

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Formula

dose ordered
dose available

x volume available

Actually this is the same formula used in the "PO dosage calculator."

Examples

1) Dr. Smith has ordered a heparin infusion of 1000 units/hour for John Doe in bed 7. The infusion is to be mixed as 25,000 units in 500 mL .9% NS. What rate will the IV pump be set to? In this example,

1000 units/hr = dose ordered
25,000 units = dose available
500 mL = volume available

1,000units
25,000units

x 500mL

which = 20 mL

So the volume to give, an infusion, = 20 mL/hour

See the example below.

Doesn't work, just an example

2) Give 40mg of Lasix^Ž (furosemide) IVP. The vial of furosemide contains 100 mg per 10 mL. In the example,

40 mg = dose ordered
100 mg = dose available
10 mL = volume available

40mg
100mg

x 10mL

which = 4 mL

So the volume to give, a 1x dose, = 4 mL

Doesn't work, just an example

Note

It doesn't matter what type of units are used in this calculator. You can figure out how many grams to give or how many milligrams to give, micrograms, units, grains, etc. Remember to be consistent (i.e. don't mix milligrams with grams).

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