Aspartate aminotransferase (AST) blood test

定义

The aspartate aminotransferase (AST) blood test measures the level of the 酶 血液中的AST.

选择的名字

Aspartate aminotransferase; Serum glutamic-oxaloacetic transaminase; SGOT

How the Test is Performed

A 血液样本 是必要的.

How to Prepare for the Test

No special preparation 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 slight bruise. This soon goes away.

Why the Test is Performed

AST is an 酶 found in high levels in the liver, heart, muscles. It is also found in lesser amounts in other tissues. An 酶 is a protein that causes a specific chemical change in the body.

Injury to the liver results in release of AST into the blood.

This test is mainly done along with other tests (such as ALT, 高山, 胆红素) to diagnose and monitor 肝脏疾病.

正常的结果

The normal range is 8 to 33 U/L.

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

What Abnormal Results Mean

An increased AST level is often a sign of 肝脏疾病. Liver disease is even more likely when the levels of substances checked by other liver blood tests have also increased.

An increased AST level may be due to any of the following:

• Scarring of the liver (肝硬化)
• Death of liver tissue
• 心脏病
• Too much iron in the body (血色沉着病)
• Swollen and inflamed liver (肝炎)
• Lack of blood flow to the liver (liver ischemia)
• Liver cancer or tumor
• Use of drugs that are toxic to the liver, especially alcohol use
• 单核细胞增多症 (“mono”)
• Muscle disease or trauma
• Swollen and inflamed pancreas (胰腺炎)

AST level may also increase after:

• 伯恩斯(深)
• 心脏手术
• 癫痫发作
• 手术

Pregnancy and exercise may also cause an increased AST level.

风险

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

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

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

参考文献

Daniels L, Khalili M, Goldstein E, Bluth MH, Bowne WB, Pincus MR. Evaluation of liver function. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24日艾德. Philadelphia, PA: Elsevier; 2022:chap 22.

普拉特DS. Liver chemistry and function tests. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease: Pathophysiology/Diagnosis/Management. 11日艾德. Philadelphia, PA: Elsevier; 2021:chap 73.