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Red Cell Distribution Width Standard Deviation (RDW-SD) Analysis

Red Cell Distribution Width Standard Deviation (RDW-SD) Analysis is a part of the complete blood count (CBC) test that measures the variation in the size of your red blood cells (RBCs). RDW-SD is a quantitative measure of the variability in size or volume of red blood cells and provides detailed information about the heterogeneity of the red blood cells.


RDW Reference Range:

  • Normal Range: 37 to 49.2 femtoliters (fL).

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RDW-SD Analysis is integral to the complete blood count, providing critical insights into red blood cell size variability, which aids in diagnosing and identifying the causes of anemia. If RDW-SD levels are elevated, further diagnostic tests such as ferritin, vitamin B12, folate levels, and reticulocyte counts are recommended to pinpoint the specific type of anemia and its underlying causes. Treatment is tailored based on these findings and may include supplementation of nutrients like iron, vitamin B12, or folate, alongside addressing any chronic underlying conditions, with regular monitoring of RDW-SD to assess and adjust treatment efficacy.

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