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Full blood count
RDW
Measures variation in the size of red blood cells.
What it measures
It measures how much red blood cell size varies in a sample.
Why it is tested
It is commonly used to help look for mixed causes of anaemia.
Low results
Low results are not usually a major concern on their own.
High results
High results may be associated with iron deficiency or mixed anaemias.
Related tests
MCV, Ferritin, Haemoglobin
Sources
Other markers
Disclaimer
This information is for education only and is not a substitute for medical advice. Results should be interpreted by a qualified clinician alongside your symptoms and medical history.