Blood gases : Normal Values & Results (Arterial blood gas analysis, ABG)

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Blood gases

Alternate Names : Arterial blood gas analysis, ABG

Normal Values

Values at sea level:

Partial pressure of oxygen (PaO2) - 75 - 100 mmHg
Partial pressure of carbon dioxide (PaCO2) - 35 - 45 mmHg
A pH of 7.35 - 7.45
Oxygen saturation (SaO2) - 94 - 100%
Bicarbonate - (HCO3) - 22 - 26 mEq/L

Note: mEq/L = milliequivalents per liter; mmHg = millimeters of mercury

At altitudes of 3,000 feet and above, the oxygen values are lower.

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What do Abnormal Results Mean?

Abnormal results may be due to lung, kidney, or metabolic diseases. Head or neck injuries or other injuries that affect breathing can also lead to abnormal results.

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Blood gases : Definition
Blood gases : Why is the Test Performed?
Blood gases : How is the Test Performed?
Blood gases : How to Prepare for the Test?
Blood gases : How will the Test Feel?
Blood gases : Risks
Blood gases : Special Considerations
Blood gases : Normal Values
Blood gases : What do Abnormal Results Mean?
Blood gases : References
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Blood gases test

Review Date : 8/10/2008
Reviewed By : David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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