High red blood cell hemoglobin refers to an increase in the number of red blood cells and hemoglobin concentration in the peripheral blood. Clinically, an increase in red blood cell count and hemoglobin concentration can be seen in the morning fasting blood draws, when there is a mild increase in red blood cell count and hemoglobin concentration in the morning fasting blood draws due to lack of food and water during the night and blood concentration. Usually, no special treatment is needed, and the normal diet can be restored to normal afterwards. In addition, some dehydrated patients, such as severe diarrhea, vomiting, and after a lot of exercise and sweating, may also have relatively high erythrocyte and hemoglobin concentrations due to reduced blood volume and blood concentration. If the erythrocyte and hemoglobin concentrations are abnormally high, it is often seen in true erythrocytosis, which is a myeloproliferative disease that requires bloodletting and oral hydroxyurea maintenance therapy.