Red blood cell volume distribution width (RDW)

The red blood cell volume distribution width is a parameter reflecting the heterogeneity of the red blood cell volume size, often the coefficient of variation of the measured red blood cell volume size. (1) The red blood cell volume distribution width is increased, which is found in iron deficiency anemia. In particular, when the MCV is still in the reference range, the red blood cell volume distribution width is increased, which is a feature of early iron deficiency anemia. (2) MCV decreased in ischemic anemia and mild Mediterranean anemia, but the red blood cell volume distribution width of the former increased, while the latter RDW was normal, which was helpful for identification. (3) Hemolytic anemia and megaloblastic anemia, MCV and red blood cell volume distribution width increased. There was no change in the distribution of MCV and red blood cell volume distribution in aplastic anemia. Basic Information Specialist classification: cardiovascular examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Tips: It is not advisable to transfuse blood before examination, and it is not suitable for strenuous exercise. Normal value Automatic blood cell analyzer: 11% to 15%. Clinical significance (1) The red blood cell volume distribution width is increased, which is found in iron deficiency anemia. In particular, when the MCV is still in the reference range, the red blood cell volume distribution width is increased, which is a feature of early iron deficiency anemia. (2) MCV decreased in ischemic anemia and mild Mediterranean anemia, but the red blood cell volume distribution width of the former increased, while the latter RDW was normal, which was helpful for identification. (3) Hemolytic anemia and megaloblastic anemia, MCV and red blood cell volume distribution width increased. There was no change in the distribution of MCV and red blood cell volume distribution in aplastic anemia. High results may be diseases: iron deficiency anemia considerations Unsuitable for the crowd: There are no people who are not suitable for the time being. Before the examination: it is not suitable for blood transfusion, and it is not suitable for vigorous exercise. After the examination: According to the proportion to determine whether there is any disease. Inspection process Clinical blood test. Not suitable for the crowd Blood was transfused during the first three weeks of the examination and during the examination. Adverse reactions and risks Dizziness or fainting: When blood is drawn, due to emotional overstress, fear, reflex caused by vagus nerve excitability, blood pressure drop, etc., the blood supply to the brain is insufficient to cause fainting or dizziness.