The red cell distribution width, when reported in Spanish, is a measurement included in a complete blood count (CBC). This parameter reflects the variation in size of red blood cells, known as anisocytosis. An elevated value suggests a greater difference in red blood cell sizes than is typically observed.
Analysis of red blood cell size variation is valuable in the differential diagnosis of various hematological conditions. Its clinical application aids in distinguishing between different types of anemia, such as iron deficiency anemia and thalassemia. The information obtained contributes to a more precise diagnosis and informs appropriate treatment strategies. Historically, this measurement was assessed visually under a microscope, but automated cell counters now provide rapid and accurate results.