Hemoglobin is hemoglobin. The most effective way to increase hemoglobin quickly is to transfuse red blood cells. By feeding someone else’s red blood cells, the number of red blood cells in the transfused person’s body will increase significantly, and the hemoglobin concentration will rise rapidly. Recombinant human erythropoietin can also be applied, which is a kind of cytokine, produced by the kidneys, and is particularly sensitive to the stimulation of hypoxia. When erythropoietin is applied, it promotes the proliferation and division of red lineage hematopoietic stem cells in the bone marrow to produce more red blood cells, and also promotes the rapid release of reticulocytes formed in the bone marrow into the peripheral blood to form mature red blood cells, which can also rapidly raise the hemoglobin concentration in the peripheral blood. For anemic patients, to rapidly increase hemoglobin concentration, blood transfusion is available and recombinant human erythropoietin can be applied.