Blood count
What does high RDW mean?
Educational guide only — not medical advice. Always review results with a qualified clinician.
RDW (red cell distribution width) reflects the spread of red blood cell sizes. A high RDW alone is not a diagnosis; causes such as iron, B12, or folate deficiency, chronic disease, or blood loss are assessed by your doctor together with MCV and other values. Interpret your result with your doctor.
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This article is educational and should be reviewed alongside our medical review, methodology, and transparency pages. Use it to prepare for a clinician conversation, not as a diagnosis.
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Blood count
Blood count
Blood count
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