Pharmacy Intravenous (IV) Calculations


Intravenous (IV) Calculations are used for assembling fluids to be administered parenterally over time directly into a patients bloodstream. This is commonly referred to as a "drip".

Let's start with some basics:

Take a look at these 3 formulas:

VOLUME ÷ TIME = RATE
RATE x TIME = VOLUME
VOLUME ÷ RATE = TIME

Notice:If you know two parts of the formula you can determine the third.


The first consideration is calculating the RATE OF FLOW based on how much the patient is to receive over a given time.

VOLUME ÷ TIME = RATE


The patient is prescribed:

3.6L of mixture over 6 hours.

Use the formula from above:

3600 ml ÷ 6 Hrs = 600ml/Hr

Next,

from here you can easily determine how much per minute.

600ml/Hr ÷ 60(min/Hr) = 10ml min



How would we determine the
volume to fill a prescription?.

RATE x TIME = VOLUME


The patient is prescribed:

300ml/Hr for 4 Hours

300ml X 4Hr = 1200ml

1.2L will be needed (volume)




If you want to determine the amount of
Time a volume will last, use the formula:

VOLUME ÷ RATE = TIME


The patient is prescribed:

1.5L of a solution at a rate of 150ml/Hr

1500ml ÷ 150ml/Hr = 10 Hours

The solution will last for 10 Hours (
Time)







Now, lets talk about:
IV Infusion Set Calculations.




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