A low mean RBC hemoglobin concentration means that the hemoglobin concentration of red blood cells in the body is lower than normal, and it is suspected that anemia or other conditions may exist. The average RBC hemoglobin concentration is an indicator of the red blood cell system in routine blood tests, together with the red blood cell count, average red blood cell volume, hemoglobin concentration and other indicators for the diagnosis and treatment of various types of anemia, and a decrease in this indicator is most often seen in microcytic hypochromic anemia. The normal range of this index is 320~360g/L (hematology analyzer method), when the decline can be seen in physiological factors such as hemodilution and pathological factors such as iron deficiency anemia, thalassemia and other microcytic hypochromic anemia, which need to be systematically examined to determine the cause of the disease and then carry out symptomatic treatment.