One clinical sign of HES is an excess of eosinophils in the bloodstream. These special white blood cells fight infections, including parasites. In healthy individuals, eosinophils compose about one to three percent of the population of standard white blood cells. People presenting symptoms of HES need blood, allergy, imaging, and stool tests to help rule out other disorders that also cause excessive eosinophils, and the doctor may also order tests to identify organ damage. Since HES often targets the liver, kidneys, and lungs, doctors usually want extensive testing on these particular organs.
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