• Test Code - PL0023
  • Test Name - ABG- Arterial Blood Gas Analysis
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Test Details & Preparation


  • Arterial Blood Gas Analysis (ABG) test is done to evaluate lung function by measuring blood pH, oxygen (O2) and carbon dioxide (CO2) to monitor treatment for lung diseases to detect an acid-base imbalance in your blood, which may indicate a respiratory, metabolic, or kidney disorder to evaluate the effectiveness of oxygen therapy.

  • Arterial Blood Gas Analysis (ABG) test is performed when you have symptoms of a respiratory problem such as difficulty breathing, shortness of breath, or rapid breathing when you are being treated for a lung disease when an acid-base imbalance is suspected periodically when you have a condition that causes an acute or chronic oxygen shortage and you are on oxygen therapy during certain surgeries to monitor your blood's O2 and CO2 levels.

  • Most often a blood sample collected from an artery, usually the radial artery in your wrist sometimes a blood sample drawn from a vein in your arm capillary blood from a heel-stick may be used for babies.

  • Typically, no preparation is needed for an Arterial Blood Gas Analysis (ABG) test however, if you are on oxygen therapy, the O2 may either be turned off for 20 to 30 minutes before the collection for a "Room Air" test. If this cannot be tolerated, or if your doctor wants to check your oxygen levels with the O2 on, the amount of oxygen being taken will be recorded.

  • Normal values will vary from lab to lab. They are also dependent on elevation above sea level as a person's blood oxygen level will be lower if they live higher than sea level.

  • Results from an arterial blood gas analysis are not diagnostic they should be used in combination with the results of other tests and exams to evaluate someone for a respiratory, metabolic, or kidney problem.

  • Abnormal results of any of the blood gas components may indicate a person is not getting enough oxygen a person is not getting rid of enough carbon dioxide and there is a problem with a person's kidney function.

  • A low partial pressure of oxygen (PaO2) suggests that a person is not getting enough oxygen, while results that are within normal range usually mean that oxygen intake is sufficient.

  • All other components of the blood gas analysis (pH, PaCO2, HCO3-) are interrelated and the results must be considered together.


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