Normal values of oxygen partial pressure and carbon dioxide partial pressure
Dec 29, 2022
Source: Cainiu Health
Dr. Li Man
Introduction
The normal reference range for partial pressure of oxygen (PaO₂) is greater than 80 mmHg, and the normal reference range for partial pressure of carbon dioxide (PaCO₂) is 35–45 mmHg. If a patient's PaO₂ is between 60–80 mmHg and PaCO₂ is between 45–50 mmHg, mild hypoxia is considered present. When PaCO₂ reaches 50–55 mmHg, it indicates further elevation.
In daily life, many people enjoy having regular health checkups to monitor their well-being. Some individuals find values for partial pressure of oxygen and partial pressure of carbon dioxide listed on their medical examination reports. So what are the normal values for partial pressure of oxygen and partial pressure of carbon dioxide?
Normal Values for Partial Pressure of Oxygen and Carbon Dioxide
The normal reference range for arterial partial pressure of oxygen (PaO₂) is greater than 81 mmHg, while the normal range for arterial partial pressure of carbon dioxide (PaCO₂) is 36–45 mmHg. If a patient's PaO₂ is between 61–81 mmHg and PaCO₂ is between 45–50 mmHg, this may indicate mild hypoxia. A PaO₂ of 46–61 mmHg and PaCO₂ of 51–56 mmHg may suggest moderate hypoxia. When PaO₂ falls below 46 mmHg and PaCO₂ exceeds 56 mmHg, it may indicate severe hypoxia.
There are two main causes of low carbon dioxide partial pressure. The first is excessive elimination of carbon dioxide, leading to decreased PaCO₂. This is commonly seen clinically in conditions such as anxiety, pain, or improper use of ventilators. The second cause is metabolic acidosis, which primarily results from excessive loss of alkaline substances in the body.
It's important to maintain good self-care habits in daily life, strengthen resistance and immunity, ensure balanced nutrition, pay attention to diet, and avoid illness. If any abnormalities occur, seek timely medical evaluation and treatment. We hope this information has been helpful. Wishing you good health and happiness!
