嗜酸性粒细胞计数-绝对

定义

An 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, 感染, 以及其他医疗十大赌博靠谱网络平台.

选择的名字

Eosinophils; Absolute eosinophil count

如何执行测试

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. 在样品中加入一种染色剂. 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 白细胞计数 to give the absolute eosinophil count.

如何准备考试

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
• 某些抗生素
• 干扰素
• 镇静剂

考试的感觉如何

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.

为什么要进行测试

You will have this test to see if you have abnormal results from a 血液鉴别试验. This test may also be done if the provider thinks you may have a specific disease.

这个测试可以帮助诊断:

• Acute hypereosinophilic syndrome (a rare, but sometimes fatal leukemia-like condition)
• An 过敏反应 (can also reveal how severe the reaction is)
• 癌症
• 早期阶段 艾迪生疾病
• 寄生虫感染
• 血管炎

正常的结果

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.

异常结果意味着什么

A high number of eosinophils (eosinophilia) are often linked to a variety of disorders. A high eosinophil count may be due to:

• 肾上腺缺乏
• Allergic disease, including hay fever
• 哮喘
• 自身免疫性疾病
• 湿疹
• 真菌感染
• Hypereosinophilic综合症
• Leukemia and other blood disorders
• 淋巴瘤
• 寄生虫感染，如蠕虫

A lower-than-normal eosinophil count may be due to:

• 酒精中毒
• Overproduction of certain steroids in the body (such as cortisol)

风险

风险 from having blood drawn are slight, but may include:

• 大出血
• 昏厥或感到头晕
• Hematoma (blood accumulating under the skin)
• Infection (a slight risk any time the skin is broken)

注意事项

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.

参考文献

Khoury P, Akuthota P, Weller PF, Klion广告. Eosinophilia and eosinophil-related disorders. In: Burks AW, Holgate ST, O' Hehir RE, Broide DH, et al. eds. Middleton's Allergy: Principles and Practice. 9日艾德. Philadelphia, PA: Elsevier; 2020:chap 73.

Klion广告. 嗜曙红的症状. 参见:Goldman L, Schafer AI主编. Goldman-Cecil医学. 26日艾德. Philadelphia, PA: Elsevier; 2020:chap 161.

罗伯茨DJ. Hematologic aspects of parasitic diseases. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8日艾德. Philadelphia, PA: Elsevier; 2023:chap 154.