Carbon dioxide (CO2) is a gaseous waste product made from the body’s metabolism. The blood carries carbon dioxide to the lungs, where it is exhaled. The kidneys and lungs regulate the levels of carbon dioxide, bicarbonate, and carbonic acid in the blood. Three forms of carbon dioxide exist in the blood: bicarbonate, carbonic acid, and dissolved carbon dioxide. A carbon dioxide test, which is also called a total carbon dioxide or TCO2 test, measures the total amount of these forms of carbon dioxide in the blood. The value for total carbon dioxide can indicate: · The ability of the lungs to release carbon dioxide. · The function of the kidneys. · Metabolic problems. · The ability of the body to maintain a normal blood pH.
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