![]() This test is commonly performed as a part of a complete blood count (CBC). ![]() thalassemias, which are inherited blood disorders that can cause severe anemia.The RDW test is used to help diagnose types of anemia and other medical conditions including: High RDW values may mean you have a nutrient deficiency, anemia, or other underlying condition. Rather, it provides shades of meaning in the context of the hemoglobin (hgb) and mean corpuscular value (MCV). Similarly, if on average your RBCs are large, but you also have a lot of very large cells, your RDW will be elevated.įor this reason, RDW is not used as an isolated parameter when interpreting a complete blood count (CBC). This means that if on average your RBCs are small, but you also have a lot of very small cells, your RDW will be elevated. Your RDW is elevated if the range of sizes is large. Normal red blood cells maintain a standard size of 6 to 8 micrometers (µm) in diameter. However, with certain diseases, you may still have a normal RDW. Anything outside of the normal range in red blood cell width or volume indicates a possible problem with bodily function that in turn may affect oxygen getting to various parts of your body. You need red blood cells to carry oxygen from your lungs to every part of your body. The red cell distribution width (RDW) blood test measures the amount of red blood cell variation in volume and size. ![]()
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