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Absolute Eosinophil Count

Also referred as

Total Eosinophil Count

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An Absolute Eosinophil Count test measures the number of eosinophils, a type of white blood cell, in the blood. This test is a key indicator of certain allergic diseases, infections, etc. in the body. It is often done as part of a complete blood count test that also measures other types of blood cells.

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Understanding Absolute Eosinophil Count

Eosinophils form an integral part of the immune system and help fight off infections. These cells play an important role in inflammatory responses to allergies. A higher-than-normal eosinophil count, also called eosinophilia, may indicate an allergic reaction, a parasitic infection, or a skin disease. Whereas, a lower-than-normal eosinophil count, also called eosinopenia, may indicate excessive stress, overproduction of cortisol hormone, alcohol misuse, or the presence of any other underlying condition.

No special preparation is required for an Absolute Eosinophil Count test; eat or drink as per your daily routine. Test result ranges are approximate and may differ slightly between different labs depending on the methodology and laboratory guidelines. Talk to your doctor about your specific test results. The results will help them determine your medical condition and formulate an overall treatment plan.

What does Absolute Eosinophil Count measure?

An Absolute Eosinophil Count test measures the number of eosinophils in the blood and provides important information about the functioning of the immune system. Eosinophils originate from bone marrow and have a lifespan of 8-18 hours. These cells are involved in fighting certain types of infections and responding to allergic reactions in the body. Other functions of these cells include movement to the inflammation areas, trapping substances, killing cells, and bactericidal and antiparasitic activities. They also help in the treatment of immediate allergic reactions and modulation of inflammatory responses. By measuring the number of eosinophils in the blood, this test provides important information about the functioning of the immune system.

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FAQs related to Absolute Eosinophil Count

Which diseases can an Absolute Eosinophil Count test detect?

An Absolute Eosinophil Count test can help identify infections and allergies, causes of inflammation, and other conditions such as autoimmune disorders.

How is an Absolute Eosinophil Count test done?

An Absolute Eosinophil Count test is done using a sample of blood that is withdrawn from a patient’s vein. The blood sample is collected in a vial and sent to the lab for analysis.

Do I need to fast before taking the Absolute Eosinophil Count test?

No fasting is required for this test. You can schedule it at your convenience without avoiding food or water beforehand.

Is there any risk associated with an Absolute Eosinophil Count test?

There is usually no risk associated with this test. However, some people may feel a slight sting while the needle is pricked and may experience some bleeding that is normal and usually not bothersome. Rarely some people may experience slight swelling or bruising at the site of the needle prick. Applying ice 3-4 times a day for about a week may help reduce swelling and bruising. If it does not get better, consult your doctor.

What are the reasons for the low eosinophil count?

The reasons for low eosinophil count (eosinophilia) include infections, an allergic reaction, or bone marrow disorders among others.

What are the reasons for the high eosinophil count?

The reasons for high eosinophil count (eosinophilia) include parasitic infections, allergic reactions, autoimmune diseases, blood disorders, etc.

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Last Updated

15th Oct 2025