# IV Flow Rate Calculation Example

IV flow rate calculations determine the flow rate of solution administered over a given time. This is normally expressed as mL/Hr or mL/min. However, you should also know how to determine how much volume would be administered using time and rate.

The flow-rate calculation below is determining how long it would take to deliver a volume at a particular rate.

A physician orders a drug to be infused at:10mcg/kg/min. The patient weighs 70kg. The total dose the patient is to receive is 21mg. How long must the IV continue for the patient to receive this dose?

1) First, we know we want to solve for time.

Â  Â  Â
Volume Ã· Rate = Time

2) Next, figure out each factor.

Â  Â  Â
Volume = 21mg

Â  Â  Â  Rate = 10mcg/kg/min - (patient is 70kg)

Â  Â  Â  Time = Minutes

3)

Â  Â  Â  Volume = 21,000mcg

Â  Â  Â  Rate =
(10mcg)(70kg)/min = 700 mcg/min

Â  Â  Â  Time = Minutes

Â  Â  Â  Volume Ã· Rate = Time

Â  Â  Â  21,000 Â Ã· 700 Â  = Â  30 Minutes

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