Hemoglobin is a pigment protein contained within the red blood cells of the human body. The most common method of measuring hemoglobin is the colorimetric method, which is able to automatically analyze the concentration of hemoglobin through a blood cell analyzer. In clinical practice, hemoglobin is an indicator of whether a person is anemic. Normal hemoglobin concentration is 120-160g/L in adult men and 110-150g/L in adult women. If it is lower than the normal range, the hemoglobin is lowered, which means there is anemia. Lower hemoglobin, there are a variety of reasons such as iron deficiency, lack of folic acid, lack of vitamin B12, these elements are the raw materials for blood production, if the lack of, will form the hemoglobin concentration will be reduced, clinically known as nutritional anemia. At the same time, due to other diseases of the bone marrow, such as aplastic anemia, leukemia, myelodysplastic syndromes, etc., also due to the damage of hematopoietic stem cells, the hemoglobin concentration is reduced.