Blood gases

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Blood gases test

Arterial blood gas analysis; ABG

Values at sea level:

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

Note: mEq/liter = milliequivalents per liter; mm Hg = millimeters of mercury

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

Abnormal results may indicate respiratory, metabolic, or renal diseases. The results may also be abnormal with head or neck injuries, or other traumas that affect breathing.

Review Date: 03/01/2007
Reviewed By: David A. Kaufman, M.D., Assistant Professor, Division of Pulmonary Medicine, Mount Sinai School of Medicine, New York, NY. Review provided by VeriMed Healthcare Network.