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Blood gas is a test that measures the concentration of oxygen, carbon dioxide and acid-base in the blood. It aims to analyze the pH value, oxygen partial pressure and carbon dioxide partial pressure of the blood. Blood gas test can check the oxygen content in the bloodstream. It also reflects the body's respiratory function, acid base balance and renal function.

When the body loses the ability to breathe normally, a blood gas test can show how much oxygen and carbon dioxide are in the blood. This is especially important for people with chronic lung diseases such as emphysema, who have difficulty getting enough oxygen. Blood gas tests also help diagnose pneumonia, heart failure, and kidney failure.

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A blood gas test needs a small sample of blood, usually taken from an artery in the wrist. At the same time, it is necessary to observe the patient's breathing situation and determine whether there is a certain degree of acidosis or alkalosis. In the hospital, arterial blood gas analysis is routinely used to investigate illness, status and hospital course in critically ill patients.

The values of oxygen and carbon dioxide in blood gas test indicate the extent of exchange between the external air and the lungs, and the acid base balance of the body. Low oxygen levels in the blood mean that not enough oxygen is getting into the blood from the lungs and tissues, while high carbon dioxide levels mean that not enough is being breathed out of the lungs. In addition, the acid-base balance of the body can also be assessed from the result. If either the oxygen or carbon dioxide values are wrong, acidosis or alkalosis may occur.

Blood gas test can not only help diagnose and treat respiratory disorders, but also can detect and assess heart and renal disorders. Therefore, blood gas is an important index for doctors to observe and diagnose the patient's condition. With the development of medical technology, blood gas tests become more accurate and safe. It has greatly helped doctors to diagnose the patient's condition and provided a better way for doctors to diagnose and treat diseases.