Inspiratory Reserve Volume (IRV) Calculator

Formula

The formula to calculate the Inspiratory Reserve Volume (IRV) is:

\[ IRV = TV + ERV \]

Where:

\(IRV\) is the Inspiratory Reserve Volume in liters
\(TV\) is the Tidal Volume in liters
\(ERV\) is the Expiratory Reserve Volume in liters

What is Inspiratory Reserve Volume (IRV)?

Inspiratory Reserve Volume (IRV) is a measure in pulmonary function testing that refers to the additional amount of air that a person can inhale after a normal inhalation. It is the maximum volume of air that can be inhaled beyond the point of a normal breath in, providing an indication of lung capacity and health. The average IRV values are about 1900 ml for women and 3100 ml for men.

Example Calculation

Let's assume the following values:

Tidal Volume (TV) = 0.5 liters
Expiratory Reserve Volume (ERV) = 1.5 liters

Using the formula:

\[ IRV = TV + ERV = 0.5 + 1.5 = 2.0 \text{ liters} \]

The Inspiratory Reserve Volume (IRV) is 2.0 liters.