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Lung Volume Test

The lung volume test tells us how much air is left behind when you breath out, which can help your doctor discover what condition you may have present in your lungs.

The test uses the nitrogen washout technique and takes about 20 mins. You will be required to gently breathe in and out through a mouthpiece and the test is not uncomfortable. This test requires you to breathe in 100% oxygen, and then the nitrogen in the lungs is washed out and measured. Exhaled Nitrogen is used to determine lung volumes in this test since normal room air that you breathe contains higher concentrations of Nitrogen (78%) compared to Oxygen, which is only 21%. It is important that your lips remain tightly sealed around the mouthpiece to prevent contamination with room air during the test. The scientist is able to detect any leaks during the test.