Hemoglobin can combine with oxygen and can transport oxygen to every place in the body, and it can also transport carbon dioxide out of the body, which can help the human body to complete the metabolism, if the human body’s hemoglobin is less it will have anemia, which has a great role for the human body. If the human body lacks iron, hemoglobin can not be synthesized normally, and the patient will have the symptoms of iron deficiency anemia. In the hospital, doctors judge whether the patient is anemic according to the concentration of hemoglobin. In the hospital, adult men test hemoglobin concentration is 120-160g/L, below the normal range is anemia, adult women test hemoglobin is 110-150g/L, below 110g/L is have anemia. Hemoglobin is a special protein that transports oxygen within red blood cells and is made up of protein and hemoglobin, where the protein portion is a tetramer of two different protein chains.