What does RDW 15.90 mean?

RDW, or Red Cell Distribution Width, measures the variation in size of red blood cells in a blood sample. An RDW of 15.90% is above the typical reference range (usually around 11.5% to 14.5%), indicating increased variability in red blood cell sizes. This can be associated with various conditions, such as anemia, nutritional deficiencies, or bone marrow disorders. It's important to interpret this value in the context of other lab results and clinical findings.