Red Cell Distribution Width

also known as RDW

NORMAL_RANGE
11.5 – 14.5 %
UNIT
%

/WHAT_IT_IS

RDW measures variation in red cell size. High RDW often appears early in nutritional anemias.

/NORMAL_RANGE

Reference: 11.5–14.5%.

What does high RDW mean?

  • +Iron, B12, or folate deficiency; recent transfusion; recovering anemia.

What does low RDW mean?

  • +Generally not clinically significant.

/ON_TRT

Not directly affected by TRT. Useful for catching subtle nutritional deficiencies that affect erythropoiesis.

/RELATED

/TRACK_THIS

Track RDW in the app.

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Last reviewed: 2026-06-04 · MyTRT does not provide medical advice. Always consult your physician.