Diagnosis Make an Appointment Refer a Patient Ask a Question Reviewed by Tho Q. Truong, MD (July 01, 2012) Test results will be reviewed by the doctor to decide if the condition is in fact HES. These criteria are: Eosinophil count in the blood greater than or equal to 1500/microliter, and lasting for more than 6 months Signs and/or symptoms of organs not working properly due to white blood cells attacking the organs, and No other apparent explanations for the increased white blood cells, such as parasitic infection or allergic disease. If vital organs like the heart or bone marrow are not working properly and it’s happening quickly, a doctor will not wait 6 months before diagnosing and considering prompt treatment for the HES. Symptoms Clinical Trials For more than 100 years, National Jewish Health has been committed to finding new treatments and cures for diseases. Search our clinical trials.