Hemoglobin 109 refers to the hemoglobin concentration of 109g/L. For adult males, hemoglobin 109g/L is mildly low, and for adult females, hemoglobin concentration of 109g/L is also mildly low, because the hemoglobin concentration of healthy adult males is 120-160g/L, and the hemoglobin concentration of healthy adult females is 110-150g/L, so 109g/L is considered mildly low hemoglobin. However, for pregnant women, hemoglobin 109g/L is normal. Our country stipulates that the hemoglobin concentration of pregnant women is normal as long as it is greater than 100g/L, because the blood volume increases during pregnancy, the hemoglobin concentration will drop accordingly, as long as it is not lower than 100g/L, it is normal. Therefore, whether hemoglobin 109g/L is normal or not can only be decided according to different people. For healthy people, hemoglobin 109g/L is low, which is mild anemia, but for pregnant women, hemoglobin 109g/L is normal.