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What is a Normal ABG Level?

Published in ABG Reference Ranges 2 mins read

A normal arterial blood gas (ABG) level falls within a specific range for pH, partial pressure of oxygen (PaO2), and partial pressure of carbon dioxide (PaCO2). These ranges can vary slightly depending on the laboratory and the individual's age, but generally accepted normal values are as follows:

Normal ABG Ranges:

  • pH: 7.35 - 7.45 This measures the acidity or alkalinity of your blood.
  • PaO2 (Partial Pressure of Oxygen): 75-100 mmHg (millimeters of mercury). This indicates the amount of oxygen dissolved in your blood.
  • PaCO2 (Partial Pressure of Carbon Dioxide): 35-45 mmHg. This reflects the amount of carbon dioxide in your blood, a byproduct of metabolism.

Important Considerations:

  • Laboratory Variation: Normal ranges can vary slightly between different laboratories. Always refer to the specific reference range provided by the laboratory that performed the test.
  • Age and other factors: Normal values can also vary based on factors such as age, altitude, and underlying health conditions. For example, individuals living at high altitudes may have lower PaO2 levels considered within the normal range for their environment. Smoking, secondhand smoke, and elevation all can affect the results.
  • Interpretation: Interpreting ABG results requires considering all three values together, as they are interconnected in maintaining acid-base balance. A healthcare professional will interpret the results in the context of a patient's clinical presentation.

References Supporting the above information:

The information provided above is supported by multiple sources, including:

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