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The asterixed values are obtained from the Advia. If your RDW is low, there are no hematologic disorders associated with a low RDW result.These reference intervals were established using our Advia 2120 Hematology Analyzer. This is a blood disorder in which your bone marrow doesn’t produce enough blood cells, including red blood cells. If your RDW result is normal but you have a high MCV, you may have aplastic anemia. If you receive a normal RDW with a low MCV, you may have an anemia resulting from a chronic disease, such as that caused by chronic kidney disease. A low MCV with a high RDW occurs in microcytic anemias. To help properly diagnose these conditions, your healthcare provider will perform a CBC test and compare the RDW and MCV test portions to measure your red blood cell volume.Ī high MCV with a high RDW occurs in some macrocytic anemias. Iron deficiency anemia is a common cause of microcytic anemia. This can be due to a deficiency of folate or vitamin B-12.Īdditionally, you may have microcytic anemia, which is deficiency of normal red blood cells, and your red blood cells will be smaller than normal. These results could also indicate macrocytic anemia, when your body doesn’t produce enough normal red blood cells, and the cells it does produce are larger than normal. If your RDW is too high, it could be an indication of a nutrient deficiency, such as a deficiency of iron, folate, or vitamin B-12. In addition to helping confirm a diagnosis when combined with other tests, RDW results can help determine the type of anemia you might have. To receive a proper diagnosis, your doctor must look at other blood tests - such as the mean corpuscular volume (MCV) test, which is also part of a CBC - to combine results and provide an accurate treatment recommendation. However, even at normal RDW levels, you may still have a medical condition. If you score outside this range, you could have a nutrient deficiency, infection, or other disorder.

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.