High red blood cell count and hemoglobin concentration are mainly due to the following reasons: 1. Blood concentration can cause a relative increase in red blood cells and hemoglobin concentration, commonly seen in acute gastroenteritis caused by severe vomiting and diarrhea, which can cause human dehydration, also seen in large burns, failure to drink water in time after strenuous exercise, diabetic ketoacidosis. 2. Also seen in people living in highland areas or with chronic cardiopulmonary The disease is a myeloproliferative disease in which the patient’s peripheral blood red blood cell count is significantly higher than normal and the hemoglobin concentration is also significantly higher.