A red blood cell count of 11 x 10^12/L suggests significantly elevated red blood cells. Erythrocytosis, cardiopulmonary disease, and dehydration may be present. 1. Erythrocytosis: Normally, the red blood cell count lies between (4.0~5.5) x 10^12/L in males, (3.5~5.0) x 10^12/L in females, and (6.0~7.0) x 10^12/L in newborns. When erythrocytosis occurs, it leads to the problem of significantly elevated red blood cell count. 2. Cardiopulmonary diseases: when patients develop chronic lung diseases and congenital heart diseases, they need to maintain the oxygen supply in the body through the compensatory function of red blood cells, so it will lead to an increase in the number of red blood cells. 3. Dehydration: When patients suffer from severe vomiting and extensive burns, the number of red blood cells in the blood increases due to dehydration. If the increase in red blood cell count is obvious, it is recommended that the patient consults the hematology department of a regular hospital to find out the cause of the increase in red blood cell count, and then treat the symptoms.