How Do You Interpret An Arterial Blood Gas Test?
The blood has several gases dissolved in it which the body normally maintains within a narrow range of concentration. An arterial blood gas (ABG) is a common test that measures the levels of these gases. Provide a blood sample. An ABG requires a healthcare worker to withdraw a small amount of blood with a thin needle. The most common site is the radial artery near the wrist, although other sites may also be used. Examine the components of an ABG. An ABG measures the partial pressure of gases such as carbon dioxide and oxygen in the blood. It will also measure the pH and the concentration of bicarbonate (HCO3-) as well as other electrolytes. Study the oxygen level. The normal partial pressure of oxygen (PaO2) in the blood is between 80 and 100 millimeters of mercury (mmHg). A PaO2 of less than 60 mmHg will require supplemental oxygen. Observe the carbon dioxide level. The partial pressure of carbon dioxide (PaCO2) in the blood normally ranges from 35 to 45 mmHg. A PaCO2 outside this ran
