Classification of anemia and its clinical significance

Clinically, anemia is divided into three degrees, namely mild anemia, moderate anemia and severe anemia. The blood volume below 90g/L is called mild anemia, while the blood volume between 60-90g/L is called moderate anemia. Severe anemia blood volume should be less than 30-60g/L, and blood volume below 30g/L is extremely severe anemia, generally requiring immediate rescue treatment.