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Red Cell Distribution Width – SD (RDW-SD)

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Red Cell Distribution Width – SD (RDW-SD)

Accredited Facility E-report Qualified Specialists

This test is done to evaluate how much red blood cells vary in size. Increased RDW indicates greater variation (anisocytosis) and helps differentiate types of anemia, such as iron deficiency, vitamin B12 deficiency, or mixed causes.

  • If anemia is suspected or diagnosed.
  • If symptoms like fatigue or weakness are present.
  • If evaluating nutritional deficiencies.
  • If part of routine health checkup (CBC).
  • Fasting: Not required.
  • No special preparation is usually needed.
  • Stay hydrated before testing.
  • Follow any instructions provided by the laboratory or healthcare provider.
    • Red Cell Distribution Width – SD (RDW-SD)
    No labs currently offering this test.