BACK TOTOP Browse A-ZSearchBrowse A-ZABCDEFGHIJKLMNOPQRSTUVWXYZ0-9 E-mail FormEmail ResultsName:Email address:Recipients Name:Recipients address:Message: Print-FriendlyBookmarksbookmarks-menuEosinophil count - absoluteEosinophils; Absolute eosinophil countAn absolute eosinophil count is a blood test that measures the number of one type of white blood cells called eosinophils. Eosinophils become active when you have certain allergic diseases, infections, and other medical conditions. How the Test is Performed Most of the time, blood is drawn from a vein on the inside of the elbow or the back of the hand. The site is cleaned with an antiseptic. The health care provider wraps an elastic band around your upper arm to make the vein swell with blood.Next, the provider gently inserts a needle into the vein. The blood collects into an airtight tube attached to the needle. The elastic band is removed from your arm. The needle is then removed and the site is covered to stop bleeding.In infants or young children, a sharp tool called a lancet may be used to prick the skin. The blood collects in a small glass tube, or onto a slide or test strip. A bandage is put on the spot to stop bleeding.In the lab, the blood is placed on a microscope slide. A stain is added to the sample. This causes eosinophils to show up as orange-red granules. The technician then counts how many eosinophils are present per 100 cells. The percentage of eosinophils is multiplied by the white blood cell count to give the absolute eosinophil count.White blood cell countA WBC count is a blood test to measure the number of white blood cells (WBCs) in the blood. WBCs are also called leukocytes. They help fight infecti...ImageRead Article Now Book Mark Article How to Prepare for the Test Most of the time, adults do not need to take special steps before this test. Tell your provider the medicines you are taking, including the ones without a prescription. Some drugs may change the test results.Medicines that may cause you to have an increase in eosinophils include:Amphetamines (appetite suppressants) Certain laxatives containing psyllium Certain antibiotics Interferon Tranquilizers How the Test will Feel You may feel slight pain or a sting when the needle is inserted. You may also feel some throbbing at the site after the blood is drawn. Why the Test is Performed You will have this test to see if you have abnormal results from a blood differential test. This test may also be done if the provider thinks you may have a specific disease.Blood differential test.A WBC count is a blood test to measure the number of white blood cells (WBCs) in the blood. WBCs are also called leukocytes. They help fight infecti...ImageRead Article Now Book Mark Article This test may help diagnose:Acute hypereosinophilic syndrome (a rare, but sometimes fatal leukemia-like condition) An allergic reaction (can also reveal how severe the reaction is) Allergic reactionAllergic reactions are sensitivities to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, and gastroin...ImageRead Article Now Book Mark Article Early stages of Addison disease Addison diseaseCushing disease is a condition in which the pituitary gland releases too much adrenocorticotropic hormone (ACTH). The pituitary gland is an organ of...ImageRead Article Now Book Mark Article Infection by a parasite Vasculitis Normal Results Normal eosinophil count is less than 500 cells per microliter (cells/mcL).Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.The example above shows the common measurements for results of these tests. Some laboratories use different measurements or may test different specimens. What Abnormal Results Mean A high number of eosinophils (eosinophilia) are often linked to a variety of disorders. A high eosinophil count may be due to:Adrenal gland deficiency Allergic disease, including hay fever Asthma AsthmaAsthma is a chronic disease that causes the airways of the lungs to swell and narrow. It leads to breathing difficulty such as wheezing, shortness o...ImageRead Article Now Book Mark Article Autoimmune diseases Autoimmune diseasesAn autoimmune disorder occurs when the body's immune system attacks and destroys healthy body tissue by mistake. There are more than 80 types of aut...ImageRead Article Now Book Mark Article Eczema EczemaAtopic dermatitis is a long-term (chronic) skin disorder that involves scaly and itchy rashes. It is a type of eczema. Other forms of eczema include...ImageRead Article Now Book Mark Article Fungal infections Hypereosinophilic syndrome Leukemia and other blood disorders Lymphoma Parasite infection, such as wormsA lower-than-normal eosinophil count may be due to:Alcohol intoxication Overproduction of certain steroids in the body (such as cortisol) Risks Risks from having blood drawn are slight, but may include:Excessive bleeding Fainting or feeling lightheaded Hematoma (blood accumulating under the skin) Infection (a slight risk any time the skin is broken) Considerations The eosinophil count is used to help confirm a diagnosis. The test cannot tell if the higher number of cells is caused by allergy or parasite infection.Open ReferencesReferencesKhoury P, Akuthota P, Weller PF, Klion AD. Eosinophilia and eosinophil-related disorders. In: Burks AW, Holgate ST, O' Hehir RE, Broide DH, et al. eds. Middleton's Allergy: Principles and Practice. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 73.Klion AD. Eosinophilic syndromes. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 161.Roberts DJ. Hematologic aspects of parasitic diseases. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 158.AllVideoImagesTogBlood cells - illustration Blood is comprised of red blood cells, platelets, and various white blood cells.Blood cellsillustrationBlood cells - illustration Blood is comprised of red blood cells, platelets, and various white blood cells.Blood cellsillustration Tests for Eosinophil count - absolute Eosinophil count - absoluteRelated Information Blood differential test(Medical Test)Allergic reactions(Injury)Hodgkin lymphoma(Condition)Atopic dermatitis(Condition)Autoimmune disorders(Condition)Asthma(Condition)Allergic rhinitis(Condition)Hodgkin disease(In-Depth)Asthma in adults(In-Depth)Allergic rhinitis(In-Depth) Review Date: 1/31/2021 Reviewed By: Diane M. Horowitz, MD, Rheumatology and Internal Medicine, Northwell Health, Great Neck, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. 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