Iron deficiency in routine blood tests mainly looks at several items: red blood cells, hemoglobin, average red blood cell volume, and average hemoglobin content. Iron deficiency leads to iron deficiency anemia, insufficient synthesis of hemoglobin, a decrease in the amount of hemoglobin, insufficient number and volume of red blood cells, and a decrease in the average hemoglobin concentration. To improve iron deficiency, on the one hand, you can supplement your diet with more iron-containing substances, such as pork liver and egg yolk. On the other hand, it is a medication supplement. Polysaccharide iron capsules are rich in iron, which can improve the iron deficiency in the body and improve the state of iron deficiency anemia in the human body. Iron has to be supplemented continuously for a period of time to see the improvement of hemoglobin.