Evans syndrome laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Laboratory Findings

The diagnosis of Evan’s Syndrome is based primarily on laboratory findings, as well as the corresponding physical signs and symptoms. A complete blood count (CBC) will confirm the presence of anemia and low platelets. Additional studies may include a peripheral smear and a Coombs test. A peripheral smear of the blood may reveal evidence of red blood cell destruction or reticulocytosis. Reticulocytes are immature red blood cells and are usually abundant in Evan’s syndrome where there is a need to replace ongoing losses. There are also distinct shapes to certain cells that may be found when a sample of the patient’s blood is viewed under a microscope. In patients with Evan’s syndrome the red blood cells may appear small and globular shaped (then called spherocytes) but will not be fragmented. A Coombs test is used to detect the presence of antibodies against the RBC and is usually positive in immune mediated hemolysis.