Low RDW is generally considered typical and may have no clinical significance. It can be seen when red blood cell sizes are uniform.
Quick summary
RDW shows how much red blood cell sizes vary and is interpreted with other red cell indices.
RDW describes the variation in red blood cell size.
To evaluate variation in red blood cell size.
This information is general and not a diagnosis.
Typical reference range: 11.5 - 14.5 %
Reference ranges may vary slightly by laboratory.
Low RDW is generally considered typical and may have no clinical significance. It can be seen when red blood cell sizes are uniform.
A result within the reference range is generally considered typical. Interpretation depends on other red cell indices.
High RDW may be associated with greater variation in red blood cell size. It can be seen with nutritional deficiencies or recent blood loss.
These summaries are educational shorthand. Doctors still compare the full panel, symptoms, medicines, and the lab's own range.
Enter a valid number to see Low / Normal / High.
This check is for quick educational context only. It is not stored as a medical record and does not replace clinical interpretation.
Low RDW is generally considered typical and may have no clinical significance. It can be seen when red blood cell sizes are uniform. It is not a diagnosis by itself.
A result within the reference range is generally considered typical. Interpretation depends on other red cell indices.
High RDW may be associated with greater variation in red blood cell size. It can be seen with nutritional deficiencies or recent blood loss. It is not a diagnosis by itself.
These are common associations, not diagnoses. Many factors can affect a single result.
A single result rarely provides the full picture on its own.
No. High RDW may be associated with varied red blood cell sizes, but it is not a diagnosis by itself.
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Theme hubs are useful when this result makes more sense as part of a liver, lipid, blood-cell, iron, or kidney-style pattern. If you have several numbers from the same group, you can enter them together there.
Start with CBC-style markers such as hemoglobin, WBC, hematocrit, MCV, and RDW when the question is about blood cell patterns.
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Check ALT, AST, ALP, GGT, and bilirubin on one page when you have several liver-related numbers from the same report.
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Check ferritin, serum iron, transferrin saturation, and TIBC on one page. B12 and folate stay as linked explanations.
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Check LDL, HDL, triglycerides, and total cholesterol on one page instead of reading one cholesterol number in isolation.
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Check fasting glucose and HbA1c on one page when the question is about blood-sugar context, not a diagnosis.
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Check TSH and Free T4 on one page when the question is about thyroid-function context, not a diagnosis.
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Check creatinine, eGFR, sodium, potassium, and calcium on one page. Uric acid stays as a linked explanation.
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Open the blood test library for related markers, or use the guide if you want a calmer overview of how results are usually reviewed together.
This website provides general health information for educational purposes only.
It is not intended as medical advice, diagnosis, or treatment.
If you have symptoms or concerns, consult a qualified healthcare professional.