You are providing care to a 14 year old male teenager that was informed by the doctor of having restrictive pulmonary disease. A pulmonary function test was performed and also a TB test was done to...

You are providing care to a 14 year old male teenager that was informed by the doctor of having restrictive pulmonary disease. A pulmonary function test was performed and also a TB test was done to evaluate his loss of in respiratory function and it was determined that he had reduced lung expansion. The child asks you several questions because he wants to learn much more about the ventilation process of his respiratory system. He asked the following questions because he noticed that you are a knowledgeable nurse.

He wants to know why the doctor had him take a deep breath and then force as much air out as possible into a round instrument with a gauge? The doctor wrote down two different measurements, what was being measured, the child asked?