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Now that you understand what will happen during a test, we’ll explain a little more about the science.

When you blow into the spirometer, a measurement of the forced expiratory volume (FEV1) over the space of a single second will be taken. Usually, a person will be able to blow out most of the air from within their lungs in a single second, and we don’t doubt that you’re going to try this yourself now. Effectively, the power of your exhalation is being measured.

The machine will also measure the total volume of air that you can push out of your lungs which is officially called the Forced vital capacity (FVC).

Once the two measurements have been made, the FEV1 will be divided by the FVC to deliver a result.

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What spirometer measurements mean

Luckily, there are only four distinctive and simple measurement which the spirometer delivers.

· Normal

· An obstructive pattern

· A restrictive pattern

· A combined and restrictive pattern

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