RDW, or red blood cell distribution width, is a blood test that measures the variation in size and volume of your red blood cells (erythrocytes). These cells are responsible for carrying oxygen from your lungs to your organs and tissues.
The RDW test can be helpful in diagnosing different types of anemia and other conditions that affect red blood cell production. A high RDW indicates that your red blood cells are more varied in size, which can be a sign of a problem with red blood cell production.
Here are some things to keep in mind about the RDW test:
- Normal Range: The normal range for RDW varies slightly depending on your age and sex. However, generally, a normal RDW is between 11.8 to 14.5 percent in adult males and 12.2 to 16.1 percent in adult females.
- High RDW: A high RDW can be caused by various conditions, including iron deficiency anemia, vitamin B12 deficiency, folate deficiency, and chronic liver disease.
- Low RDW: A low RDW is less common and may indicate a condition like thalassemia or sickle cell anemia.
The RDW test is often performed along with other blood tests, such as a complete blood count (CBC), to provide a more comprehensive picture of your overall health.
