Normal value of oxygen partial pressure
Dec 29, 2022
Source: Cainiu Health
Dr. Li Man
Introduction
Partial pressure of oxygen in blood refers to the tension exerted by oxygen dissolved in the bloodstream. It is divided into arterial blood oxygen partial pressure and venous blood oxygen partial pressure, with normal values of approximately 100 mmHg and 40 mmHg, respectively. The arterial partial pressure reflects the health status of a patient's lungs. This test is commonly performed in patients with pneumonia.
In daily life, many people enjoy routine physical checkups to monitor their health. During these exams, values such as partial pressure of oxygen often appear in blood test results. So what is the normal range for oxygen partial pressure?
Normal Range for Oxygen Partial Pressure
Blood oxygen partial pressure refers to the tension exerted by oxygen dissolved in the bloodstream after inhalation. It is divided into arterial blood oxygen partial pressure (PaO₂) and venous blood oxygen partial pressure (PvO₂). The normal value for arterial blood oxygen partial pressure is approximately 100 mmHg, while venous blood oxygen partial pressure is around 40 mmHg. Arterial oxygen partial pressure reflects the health status of a patient's lungs. This test is commonly performed in patients with pneumonia; when arterial oxygen partial pressure drops below 60 mmHg, it indicates severe pneumonia requiring oxygen therapy.
Under normal breathing conditions, the normal range for oxygen partial pressure is between 80 mmHg and 100 mmHg. Oxygen partial pressure is the most sensitive indicator of hypoxia. A value between 60 mmHg and 80 mmHg indicates mild hypoxia; 45 mmHg to 60 mmHg indicates moderate hypoxia; and below 45 mmHg indicates severe hypoxia. An oxygen partial pressure below 80 mmHg is considered hypoxemia. When PaO₂ falls below 60 mmHg, it suggests respiratory failure. Tissue oxygen partial pressure is typically about 30 mmHg, and oxygen exchange can only occur effectively if the oxygen partial pressure remains above 30 mmHg.
It's important to maintain good self-care habits, strengthen immunity and resistance, ensure balanced nutrition, pay attention to diet, and avoid illness. If any abnormalities occur, seek timely medical examination and treatment. We hope this information helps. Wishing you good health and happiness!
