Blood gases

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Blood gases test

Overview Risks Results

Blood gases

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 values for oxygen are lower.

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

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