Arterial blood gas (abg) analysis and pulse oximetry


  • Arterial blood gas tests measure the levels of oxygen and carbon dioxide in the arterial blood and determine the acidity (pH) of the blood. Taking a blood sample from an artery using a needle may cause a few minutes of discomfort. Usually the sample is taken from an artery in the wrist (radial artery). Oxygen, carbon dioxide, and acidity levels are important indicators of lung function because they reflect how well the lungs are getting oxygen into the blood and getting carbon dioxide out of it.
    (See also Medical History and Physical Examination for Lung Disorders.)


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