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Red Cell Distribution Width Testing (RCDW)

The Red Cell Distribution Width test is also known as a RDW, RDW-CV or RDW-SD test.

All you need to know about testing Red Cell Distribution Width levels with a laboratory test

  • What is the Red Cell Distribution Width test for?
  • How to test Red Cell Distribution Width?
  • What if Red Cell Distribution Width results are high?
  • What if Red Cell Distribution Width results are low?
  • Who should take the Full Blood Count (FBC) Blood test?

Red Cell Distribution Width Testing UK Statistics 2026

Icon For Red Cell Distribution Width
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8.1% of people tested have Red Cell Distribution Width levels which are too high.

And 0.2% have levels that are too low.

13.4

Low
< 11.5

Normal
11.5 - 15.0

High
15.0 +

The average Red Cell Distribution Width result is 13.4
Note what is normal for you may differ for your age and sex.

Are you in the 91.7% with normal results?
Get Tested ›

What Is The Red Cell Distribution Width Test For?

Red blood cell distribution width (RCDW) tests the amount of variation in the volume of your red blood cells.

This is closely related to the Red Cell Count.

How To Test Red Cell Distribution Width

By buying a laboratory test kit with professional nurse or clinic collection, you can accurately measure Red Cell Distribution Width for total reassurance.

Professional analysis in an accredited laboratory ensures rapid result delivery.

The Vitall Full Blood Count (FBC) nurse or clinic test kit includes a Red Cell Distribution Width test and is available for just £79.00.

Tests which include a Red Cell Distribution Width test:

Health is in your hands
Health is in your hands
Take Control Of Your Health | Home Blood Testing Services

Full Blood Count (FBC) Test Kit

Full Blood Count (FBC) test kit
Full Blood Count (FBC) Home Test Kit UK

Full Blood Count (FBC) Test Kit

Measure your general blood and immune health and ability to fight viral & bacterial infections

£79.00

View Full Details ›
Health is in your hands
Health is in your hands
Take Control Of Your Health | Home Blood Testing Services

Immune Health Test Kit

Immune Health test kit
Immune Health Home Test Kit UK

Immune Health Test Kit

Measure your immune system health and ability to fight viral & bacterial infection

£79.00

View Full Details ›

What if Red Cell Distribution Width Results Are High?

High red blood cell distribution width (RDW) can be an indication of a nutrient deficiency. It can also be linked to types of anaemia where the body does not produce enough normal red blood cells.

RDW is commonly interpreted alongside other results from the full blood count, since the pattern across related blood measurements can help clarify the likely cause.

What if Red Cell Distribution Width Results Are Low?

Usually, a low RCDW is not a problem when seen on its own.

This result is generally interpreted alongside other measurements in the full blood count.

Who Should Take This Test?

Measure your Red Cell Distribution Width levels and measure your general blood and immune health and ability to fight viral & bacterial infections with a Full Blood Count (FBC) nurse or clinic finger-prick bloodtest kit

You get the convenient testing with the reassurance of professional clinical analysis. Your results are delivered quickly & securely online.

This Full Blood Count (FBC) Test is advised if you:

  • want the convenience of home testing without waiting for a GP appointment;
  • need a high quality, clinically accredited test done in a professional clinical laboratory.

Other Biomarkers Often Tested With Red Cell Distribution Width

Urine, swab or bood test. This test is available to buy online Basophils
Urine, swab or bood test. This test is available to buy online Eosinophils
Urine, swab or bood test. This test is available to buy online Full Blood Count
Urine, swab or bood test. This test is available to buy online Haematocrit
Urine, swab or bood test. This test is available to buy online Haemoglobin
Urine, swab or bood test. This test is available to buy online Lymphocytes
Urine, swab or bood test. This test is available to buy online Mean Corpuscular Haemoglobin
Urine, swab or bood test. This test is available to buy online Mean Corpuscular Haemoglobin Concentration
Urine, swab or bood test. This test is available to buy online Mean Corpuscular Volume
Urine, swab or bood test. This test is available to buy online Mean Platelet Volume
Urine, swab or bood test. This test is available to buy online Monocytes
Urine, swab or bood test. This test is available to buy online Neutrophils
Urine, swab or bood test. This test is available to buy online Platelet Count
Urine, swab or bood test. This test is available to buy online Red Cell Count
Urine, swab or bood test. This test is available to buy online Red Cell Distribution Width
Urine, swab or bood test. This test is available to buy online White Cell Count

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