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Definition:
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Anti-smooth muscle antibody is a blood test that detects the presence of antibodies against smooth muscle.
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How the test is performed:
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A blood sample is needed. This may be taken through a vein. The procedure is called a venipuncture.
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How to prepare for the test:
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No special preparation is needed.
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How the test will feel:
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When 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.
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Why the test is performed:
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Your doctor may order this test if you have signs of certain diseases (such as hepatitis and cirrhosis) that can trigger the body to form antibodies against smooth muscle.
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Normal Values:
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Normally, there are no antibodies present.
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
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What the risks are:
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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.
Other risks associated with having blood drawn are slight but may include:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
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