According to the World Health Organization, anemia is diagnosed according to the amount of hemoglobin in the body, and the normal range of values varies according to age and gender. Anemia is diagnosed when the hemoglobin of adult men is less than 130 g/L, when the hemoglobin of adult women is less than 120 g/L, when the hemoglobin of pregnant women is less than 110 g/L, when the hemoglobin of children younger than 6 years of age is less than 110 g/L, and when the hemoglobin of children between the ages of 6 and 14 years of age is less than 120 g/L. Anemia is diagnosed in children younger than 6 years of age with a hemoglobin of less than 110 g/L and in children 6-14 years of age with a hemoglobin of less than 120 g/L. Hemoglobin is the main component of red blood cells, composed of iron ions and low protein, the human body is rich in protein reserves, but the iron content is limited, so most of the problems of anemia appear in the iron ions, if the diagnosis of anemia need to check the iron four to diagnose whether the iron deficiency anemia.