Please be patient! It may take up to ONE minute to load all the Engines.
Problems? Please contact our support.
Eosinophil count - absolute
Alternative namesThis is a test to measure the number of eosinophils (a type of white blood cell) in the blood. (See also blood differential .)
How the test is performed
Blood is drawn from a vein, usually on the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic, and an elastic band is placed around the upper arm to apply pressure and restrict blood flow through the vein. This causes veins below the band to fill with blood.
A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the band is removed to restore circulation. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
How to prepare for the testNo special preparation is necessary.
For infants and children:
The preparation you can provide for this test depends on your child's age, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following topics:
How the test will feelWhen the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performedEosinophils are white blood cells active in allergic diseases, parasitic infections, and other disorders. An eosinophil count may be ordered if the blood differential is abnormal, or if there is suspicion of specific diseases.
The eosinophil count may help your doctor:
Normal ValuesLess than 350 cells/mcl (cells per microliter)
What abnormal results meanIncreased eosinophils (eosinophilia) is most often associated with allergic diseases and parasites (such as worms).
Possible disorders include:
What the risks are
Special considerationsThe eosinophil count is nonspecific (it does not tell, for example, if an increase is caused by allergy or parasite infection). It is most often used to confirm a diagnosis.
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Update Date: 6/1/2003Marcia S. Brose, M.D., Ph.D., Division of Hematology/Oncology, Hospital of the University of Pennsylvania, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT