Blood test

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Low RDW level in the blood

Blood test
Low RDW level in the blood
Last update: 12/01/2021

What is a low RDW called?

  • Isocytosis

What is the normal RDW level in the blood?

If you need to know which are the RDW reference ranges or you require more information about the role of RDW in the blood, you can visit normal RDW level in the blood

What does a low RDW in a blood test mean?

A low percentage of RDW (Red cell blood Distribution Width) has no clinical meaning and it is not a matter for concern.

It is called isocytosis and it means that RBCs (red blood cells) are very similar in size. It may be even consider a positive sign because the size of the RBCs is very similar and means no interference in their production.

The RDW (Red cell blood Distribution Width) is only useful when it is high to discern between different types of anemia.

  • Mild isocytosis (< 11.5 %):

    Isocytosis has no clinical meaning and it is not something to be worried about.

    It does not mean the existence of any disease and does not require any kind of treatment.

Which factors can reduce the RDW?

There are no medication or factors for a low RDW in a blood test.

It may be due an intrinsic characteristic of a person.

Which diseases can reduce your RDW?

There is no disease with a RDW percentage below normal range.

What can I do to increase the RDW level in the blood?

A RDW percentage below the normal range is not a negative sign and therefore no action is required to increase the percentage.

Where can I find more information about RDW level in the blood?

You can visit our pages about:

Which values are considered a low RDW level in the blood?

The following values are considered to be above the normal range:

IMPORTANT: These levels are expressed in %. They are an example of a healthy woman of about 45 years old with no known disease and not taking any medication. The ranges can be different depending on the laboratory or on your personal circumstances.

Mild isocytosis
11.4 %11.3 %11.2 %11.1 %11 %10.9 %10.8 %10.7 %
10.6 %10.5 %10.4 %10.3 %10.2 %10.1 %10 %9.9 %
9.8 %9.7 %9.6 %9.5 %9.4 %9.3 %9.2 %9.1 %
9 %       
Medically reviewed by our Medical staff on 12/01/2021


  • A Manual of Laboratory and Diagnostic Test. 9th edition. Frances Fischbach. Marshall B. Dunning III. 2014. Pag 100. ISBN-10: 1451190891.
  • Laboratory tests and diagnostic procedures with nursing diagnoses (8th ed), Jane Vincent Corbett, Angela Denise Banks, ISBN: 978-0-13-237332-6, Pag. 35.

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