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Arterial Blood Gas


An Arterial Blood Gas (ABG) analysis is a blood test that measures how well your lungs are bringing oxygen into your blood and removing carbon dioxide. As blood passes through your lungs, oxygen moves into the blood while carbon dioxide moves out of the blood into the lungs. An ABG test uses blood drawn from an artery, where the oxygen and carbon dioxide levels can be measured before they enter body tissues.

An ABG test is done to:

  • Check for severe breathing problems and lung diseases, including COPD, asthma, or cystic fibrosis.
  • Check the progress of treatment for lung diseases.
  • Determine if you need extra oxygen or help with breathing.
  • Determine if you are receiving the right amount of oxygen while in the hospital.
  • Measure the acid-base level in the blood of people who have uncontrolled diabetes, sleep disorders, heart failure, kidney failure, severe infections, or after a drug overdose.
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