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It is possible to have bleeding or infection where the needle was inserted.

You may feel brief pain when the needle is inserted or when a tube attached to the needle fills with blood. For this test, blood will be taken from an artery, usually in the wrist where your pulse is measured. Arterial blood gas tests are usually performed in a hospital, but may be done in a doctorвЂ™s office. Arterial blood gas tests directly measure the levels of gases, such as oxygen and carbon dioxide, in your blood.It causes no pain and has few or no risks.

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For this test, a probe will be placed on your finger or another skin surface such as your ear. Pulse oximetry estimates oxygen levels in your blood.You also may need to have blood drawn to measure the level of hemoglobin in your blood. For this test, you will breathe in and out through a tube for several minutes without having to breathe intensely.

Lung diffusion capacity assesses how well oxygen gets into the blood from the air you breathe.Some people feel lightheaded or tired from the required breathingВ effort. The procedure is similar to spirometry, except that you will be in a small room with clear walls. Lung volume tests are the most accurate way to measure how much air your lungs can hold.Some people feel lightheaded or tired from the required breathing effort. For this test, you will breathe multiple times, with regular and maximal effort, through a tube that is connected to a computer. Spirometry measures the rate of air flow and estimates lung size.The purpose, procedure, discomfort, and risks of each test will vary. You may have one or more of these tests to diagnose lung and airway diseases, compare your lung function to expected levels of function, monitor if your disease is stable or worsening, and see if your treatment is working. Another pulmonary function test, called fractional exhaled nitric oxide (FeNO), measures nitric oxide, which is a marker for inflammation in the lungs. These tests include pulse oximetry and arterial blood gas tests. Other tests measure how well gases such as oxygen get in and out of your blood.

They include tests that measure lung size and air flow, such as spirometry and lung volume tests.