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Overview & Description. This test is used to determine the amount of bicarbonate, called HCO3, in the blood. The test actually measures the blood level of carbon dioxide, called CO2. During laboratory testing, HCO3 is converted to CO2. HCO3 is important in neutralizing acids.he normal value for CO2 in the blood is 23 to 29 mEq/L. Most of the carbon dioxide in the blood is in the form of bicarbonate. Either term can be used.
T3 is normally present in very small amounts, but has a significant impact. The range for normal values is 100 to 200 nanograms per deciliter, according to Medline Plus. Greater-than-normal values may be due to hyperthyroidism, thyroid cancer or high levels of a protein that carries T3 in the blood.Lower-than-normal values may indicate hypothyroidism, starvation or a long illness.hyroxine is also known as T4 because it contains four iodine atoms, according to thyroid.com. Most T4 is transported in the bloodstream by proteins, and the liver converts T4 into T3. A typical normal range, says Medline Plus, is 4.5 to 11.2 micrograms per deciliter.