Anemia is a clinical syndrome that occurs when the volume of red blood cells in the peripheral blood is lower than normal. In clinical practice, the hemoglobin concentration is often used to determine whether a person is anemic, and the three anemias are generally the average red blood cell volume, the average red blood cell hemoglobin volume, and the average red blood cell hemoglobin concentration. Anemia triple test is normal, but there is anemia, this condition is clinically called orthocytic anemia, that is, the average volume of red blood cells, average red blood cell hemoglobin volume, and average red blood cell hemoglobin concentration are normal, but the hemoglobin concentration is reduced, the most common disease of this condition is aplastic anemia, but this disease is an orthocytic anemia, the hemoglobin is very low, but The anemia triple test is normal. In addition, acute blood loss anemia, such as ruptured ectopic pregnancy or gastrointestinal hemorrhage, can also occur when the anemia triplet is normal but the hemoglobin is decreased.