HB is the abbreviation for hemoglobin. Hemoglobin, commonly known as hematin, is a kind of pigment protein in the human body, mainly in the human body’s red blood cells, and hemoglobin plays an important physiological function in the human body, its main role is to transport oxygen and carbon dioxide, and the special structure of hemoglobin is closely related to the hemoglobin. 1 molecule of hemoglobin can be bound to 4 molecules of oxygen, hemoglobin can be bound to oxygen to form oxygenated hemoglobin, and transported to the tissues and organs with the blood circulation. Blood circulation is transported to the tissues and organs, and then oxygen is separated from hemoglobin for the metabolism of the tissues and organs of the body, and at the same time, the carbon dioxide produced by the metabolism of the organs is combined with hemoglobin to form carbon-oxygenated hemoglobin, and then it is transported to the lungs and discharged out of the body through respiration. If the concentration of human hemoglobin decreases, the ability to carry oxygen will decrease, the body will appear a series of anemia symptoms, manifested as pale, dizziness, fatigue, panic and chest tightness, limb weakness after activity and so on.