RDW (Red Cell Distribution Width) normal range — check your value

Roughly 11.5 to 14.5 percent.

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Your RDW (Red Cell Distribution Width) test value

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RDW (Red Cell Distribution Width)

What RDW (Red Cell Distribution Width) measures

How much red cell sizes vary from one another, often the earliest clue to a developing deficiency.

RDW (Red Cell Distribution Width) normal range chart

ResultRDW (Red Cell Distribution Width) (%)

Below rangeBelow 11.6

In range11.6 – 14

Above range14 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

RDW (Red Cell Distribution Width) normal range by age and gender

AgeMaleFemale

0–1 years11.6 – 14 %11.6 – 14 %

2–6 years11.6 – 14 %11.6 – 14 %

7–11 years11.6 – 14 %11.6 – 14 %

12–17 years11.6 – 14 %11.6 – 14 %

18–30 years11.6 – 14 %11.6 – 14 %

31–45 years11.6 – 14 %11.6 – 14 %

46–60 years11.6 – 14 %11.6 – 14 %

60 years and above11.6 – 14 %11.6 – 14 %

What a high RDW (Red Cell Distribution Width) means, and common causes

Red cells vary more in size than usual, called anisocytosis. A raised RDW often appears before haemoglobin falls, making it an early clue.

Common causes: Early iron, B12 or folate deficiency, a mixed deficiency of more than one nutrient, recent blood transfusion, and recovery from anaemia as new cells appear.

What a low RDW (Red Cell Distribution Width) means, and common causes

A low RDW means cells are unusually uniform in size and carries no clinical significance.

Common causes: Nothing that needs attention.

Frequently asked questions

Roughly 11.5 to 14.5 percent.

This is often the earliest sign of a developing deficiency, before anaemia sets in. Iron studies and B12 are the usual next tests.

Laal kanikaon ka size alag alag hai, jo aksar iron ya B12 ki kami ki shuruaati nishani hoti hai.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.