镰状细胞试验

定义

The sickle cell test looks for the abnormal 血红蛋白 in the blood that causes the disorder sickle cell disease.

Alternative Names

Sickledex; Hgb S test

How the Test is Performed

A 血液样本 是必要的.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a bruise. This soon goes away.

Why the Test is Performed

This test is done to tell if a person has abnormal 血红蛋白 that causes sickle cell disease and sickle cell trait. Hemoglobin is a protein in red blood cells that carries oxygen.

In sickle cell disease, a person has two abnormal 血红蛋白 S genes. A person with sickle cell trait has only one of these abnormal genes and no symptoms, 或者只是轻微的.

This test does not tell the difference between these two conditions. Another test, called 血红蛋白 electrophoresis, will be done to tell which condition someone has.

正常的结果

A normal test result is called a negative result.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results.

What Abnormal Results Mean

An abnormal test result indicates the person might have one of these:

• Sickle cell disease
• 镰状细胞性状

Iron deficiency or blood transfusions within the past 3 months can cause a false negative result. This means the person might have the abnormal 血红蛋白 for sickle cell, but these other factors are making their test results appear negative (normal).

风险

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Obtaining a 血液样本 from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

• Excessive bleeding
• 晕倒 or feeling lightheaded
• Multiple punctures to locate veins
• 血肿 (blood buildup under the skin)
• Infection (a slight risk any time the skin is broken)

参考文献

Centers for Disease Control and Prevention website. Get screened to know your sickle cell status. www.疾病预防控制中心.gov/sickle-cell/sickle-cell-trait/fact-sheet-get-screened-to-know-your-sickle-cell-status.html. Updated May 15, 2024. Accessed May 27, 2024.

Centers for Disease Control and Prevention website. Sickle Cell Disease (SCD) About sickle cell disease. www.疾病预防控制中心.gov/sickle-cell/about/index.html. Updated May 15, 2024. Accessed June 25, 2024.

Menapace LA, Thein SL. Clinical aspects of sickle cell disease. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8日艾德. Philadelphia, PA: Elsevier; 2023:chap 43.