Hemoglobin 104g/L, meaning that the concentration of hemoglobin in the person’s blood is 104g/L, suggests a low level, which may be associated with anemia or increased blood volume from various causes. The normal adult male hemoglobin reference range is 120-160g/L, female 110-150g/L, and neonate 170-200g/L, so when the hemoglobin concentration is 104g/L, it suggests a lower than normal value. When suffering from aplastic anemia, iron deficiency anemia, iron granulocyte anemia, megaloblastic anemia, hemolytic anemia, thalassemia and other kinds of anemia, large amount of blood loss and other diseases, it may cause red blood cell loss, destruction, causing hemoglobin concentration to decrease. And water retention in the body can also cause an increase in plasma, resulting in blood dilution and a decrease in hemoglobin concentration. When the hemoglobin concentration decreases, the cause should be clarified under the guidance of a doctor for active treatment.