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.
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?.
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:
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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