American Association of Critical-Care Nurses (AACN) Certification Practice Test

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What does RDW measure in terms of red blood cells?

Average volume of RBCs
Shape of RBCs
Variation in RBC size
Color intensity of RBCs

The correct answer is: Variation in RBC size

The measurement known as Red Cell Distribution Width (RDW) specifically assesses the variation in the size of red blood cells (RBCs). This parameter is crucial because it helps healthcare providers determine the presence of conditions that may affect the production and morphology of red blood cells. A high RDW might indicate conditions like anemia, where there is a mix of small and large cells, reflecting an underlying pathology that influences erythropoiesis. Monitoring RDW contributes to differentiating between various types of anemia and other blood disorders, making it a valuable indicator of individual health status. Understanding RDW and its implications enhances a clinician's ability to provide a comprehensive evaluation of a patient's hematological condition, guiding further diagnostics and treatment options.