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How is an eosinophil count done?

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If your doctor wants an absolute eosinophil count, you’ll need a blood test. During the test, your nurse will put a needle into one of your veins and take out some blood.

In a lab, a technician will add a special stain to your blood sample. This'll help them see the eosinophils and count how many you have in every 100 cells. They’ll multiply that percentage by your white blood cell count to get your absolute eosinophil count.

Generally, a normal test value is less than 350 cells per microliter (cells/mcL). But because this number might not be the same at every lab, you should talk with your doctor to understand your results.

SOURCES:

UCSF Medical Center: "Eosinophil Count Absolute."

UCLA: "Cushing's Disease."

Mayo Clinic: "Eosinophilia."

Cincinnati Children’s Hospital: "What is an Eosinophilic Disorder?"

Reviewed by Dan Brennan on May 21, 2019

SOURCES:

UCSF Medical Center: "Eosinophil Count Absolute."

UCLA: "Cushing's Disease."

Mayo Clinic: "Eosinophilia."

Cincinnati Children’s Hospital: "What is an Eosinophilic Disorder?"

Reviewed by Dan Brennan on May 21, 2019

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