Blood tests are always an indispensable indication in every general health check-up, because the results of blood tests can reflect the health status of the individual. A complete blood count test can help doctors diagnose and detect problems such as disorders, infections or immune system disorders. In a blood test, there is an RDW index, so what are RDW blood cells and what is the meaning of the RDW index in a blood test? This article will help readers answer this question.