Normal value of oxygen partial pressure

Dec 29, 2022 Source: Cainiu Health

Dr. Li Man

Introduction

The normal partial pressure of oxygen is 11.6 kPa to 13.3 kPa for children and adults, and 8.5 kPa to 12.0 kPa for newborns. Before blood collection, it should be specified whether the patient is receiving supplemental oxygen. Blood specimens must be protected from exposure to external air and promptly delivered to the laboratory. Certain medications can increase or decrease blood acidity.

In daily life, many people like to have regular medical checkups at hospitals to assess their physical health. Some individuals may notice the term "partial pressure of oxygen" appearing on their test reports. So, what exactly is the normal value for the partial pressure of oxygen?

Normal Value for Partial Pressure of Oxygen

The normal range for the partial pressure of oxygen (PaO₂) is 11.6 kPa to 13.3 kPa for children and adults, and 8.5 kPa to 12.0 kPa for newborns. Before blood sampling, it should be clarified whether the patient has been receiving supplemental oxygen. The blood sample must be protected from exposure to external air and promptly delivered to the laboratory for analysis. Certain medications can affect blood acidity—some, such as sodium bicarbonate and phenylbutazone, increase blood acidity (lower pH), while others, such as tetracycline and isoniazid, may decrease blood acidity (raise pH).

The partial pressure of oxygen in arterial blood primarily refers to the tension exerted by dissolved oxygen molecules in the bloodstream. A higher oxygen partial pressure indicates effective gas exchange, allowing for proper elimination of carbon dioxide and intake of oxygen, thereby maintaining normal metabolic balance. Clinically, a PaO₂ value below 60 mmHg indicates hypoxemia and is diagnostic of Type I respiratory failure. In such cases, oxygen therapy should be administered based on the underlying cause and individual condition. For patients with chronic lung diseases, continuous low-flow oxygen therapy is often recommended.

Everyone should pay attention to personal health maintenance and strengthen their immune system. If any abnormalities are detected, prompt medical evaluation and treatment are essential. We hope this information has been helpful. Wishing you good health and a happy life!

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