A red blood cell count of 3.2 x 10¹²/L suggests a decrease in the index, and the hemoglobin count needs to be evaluated to determine the presence of anemia. Under normal circumstances, the normal value of the number of red blood cells is between (4.0 and 5.5) × 10¹²/L in adult males, between (3.5 and 5.0) × 10¹²/L in females, and in newborns is located between (6.0 and 7.0) × 10¹²/L. When the number of red blood cells decreases, the hemoglobin value is evaluated to determine the presence of anemia. Hemoglobin values below 110 g/L in males are considered to be anemic, and below 100 g/L in females are considered to be anemic, and the underlying cause of anemia needs to be assessed based on the levels of ferritin, folic acid, and vitamin B₁₂ for etiologic treatment. Anemia can be seen in a variety of diseases such as aplastic anemia, iron deficiency anemia, megaloblastic anemia, leukemia, myelodysplastic syndromes, tumor invasion of the bone marrow, systemic lupus erythematosus, severe infections, and acute hematopoietic arrest. The normal role of red blood cells is to transport oxygen and various nutrients, and the life span of red blood cells is about 100~120 days. An increase in the number of red blood cells clinically suggests that there may be a true erythrocytosis; a decrease in the number of red blood cells needs to be combined with the number of hemoglobin to determine whether there is a problem of anemia. If anemia is suspected, it is recommended to consult the hematology department of a regular hospital for a definitive diagnosis under the guidance of a physician.