## question about math ( IV calculation )

by Heather

(Long Beach, CA)

What is the flow rate to be used to infuse 1200 ml of dextrose 5% in water over 4 hours if the set delivers 15 drops per ml?

reply (by Keith): Heather, I believe you are asking about drops(gtt) per Min.? Here is the breakdown I come up with:

The patient is prescribed:

**1200ml of mixture over 4 hours.**

**1200ml ÷ 4 Hrs = 300ml/Hr**

determine how much per Minute.

**300ml/Hr ÷ 60(min/Hr) = 5ml/min**

We arrived at **5ml/min**

The Infusion set device delivers **15 gtt/ml,**

Now, Simply take the amount of **ml/min**

and **Divide** it by the **gtt/ml**.

**5ml/min x 15gtt/ml = 75gtt/min**

Go to the IV CALCULATIONS page for more examples.