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Eosinophil Cell Count Test


Why is this procedure done?


Eosinophils are a kind of white blood cell or WBC. Your blood is made of 3 kinds of cells: Red blood cells, white blood cells, and platelets. Often, one of the first tests a doctor will order is a complete blood count or CBC. This helps the doctor learn more about the cause of your illness. If your doctor is worried about infection or certain illnesses, you may need to have more tests on your WBCs. This is called a differential or "diff. " � Different kinds of WBCs include neutrophils, lymphocytes, monocytes, eosinophils, and basophils. � �
Your doctor may order an eosinophil count: � �
  • As a part of a differential
  • If you have problems like asthma or allergies
  • If you have inflammatory problems like celiac disease or inflammatory bowel disorder
  • Learn more about signs of swelling or infection
  • Get information about problems with your blood or bone marrow
  • Go along with other tests you are having
  • If there is concern about infection from parasites


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What will the results be?


  • The doctor will look at the results of your test and what is normal.
  • Your doctor may compare your results to tests you have had before.
  • If the results are normal, it is likely that you do not have an illness that affects the white blood cells.
  • If the results are not normal, you may have a problem that is causing you to have too many or too few of a certain kind of white blood cell.
  • Your doctor may order another test to verify the diagnosis.
  • The doctor will talk with you about treatment.

What happens before the procedure?


  • There are no special things to do before the test. Wearing a short-sleeve shirt on the day of the test can make things easier.
  • Talk to your doctor about:
    • All the drugs you are taking. Some drugs may affect the test results.
    • If you have any bleeding problems

What happens during the procedure?


  • It will only take a few minutes to have this test. You will be awake the whole time. You will have a small amount of blood taken from you with a needle. You may have a small amount of pain. The needle will be taken out and a bandage will be put on your skin. The blood will be sent to the lab for testing.
  • Instead of using a needle, the staff may prick your finger and smear some blood on a slide or collect it in a small tube. In babies, the heel is pricked instead of the finger.

What happens after the procedure?


  • You may want to sit quietly for a few minutes before standing up. This will help keep you from feeling dizzy after the test.
  • Put pressure with your other hand where the needle was. This will help with bruising and bleeding.
  • Ask your doctor when you will get the results.

What care is needed at home?


You may do your everyday activities when you get back home. � �

What follow-up care is needed?


Your doctor may ask you to make visits to the office to check on your progress. Be sure to keep these visits. This test will help your doctor understand if you have a problem with your white blood cells. Together you can make a plan for more care. � �

What problems could happen?


  • Pain
  • Bruising
  • Bleeding
  • Feeling dizzy
  • Infection

Where can I learn more?


American Association for Clinical Chemistry � �
http://labtestsonline.org/understanding/analytes/differential/tab/test#when � �
KidsHealth � �
http://kidshealth.org/parent/general/sick/labtest4.html � �

Consumer Information Use and Disclaimer


This information is not specific medical advice and does not replace information you receive from your health care provider. This is only a brief summary of general information. It does NOT include all information about conditions, illnesses, injuries, tests, procedures, treatments, therapies, discharge instructions or life-style choices that may apply to you. You must talk with your health care provider for complete information about your health and treatment options. This information should not be used to decide whether or not to accept your health care providers advice, instructions or recommendations. Only your health care provider has the knowledge and training to provide advice that is right for you. � �

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