Background:The Westergren method is the golden standard for
measuring erythrocyte sedimentation rate (ESR). All ESR meth-ods should agree with the standardized method of the International
Council for Standardization in Hematology (ICSH). Citrate sam-ples are commonly used for ESR. This extra sample adds costs and
can be inconvenient for the patient. Therefore, some new automat-ed ESR analyzers use EDTA samples, which are available for other
hematology measurements