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Blood test
Blood test


Types of muscle tissue
Types of muscle tissue


Anti-smooth muscle antibody

Definition:

Anti-smooth muscle antibody is a blood test that detects the presence of antibodies against smooth muscle.



How the test is performed:

A blood sample is needed. This may be taken through a vein. The procedure is called a venipuncture .



How to prepare for the test:

No special preparation is needed.



How the test will feel:

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.



Why the test is performed:

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.



Normal Values:

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.



What abnormal results mean:

A positive test may be due to:

The test also helps distinguish autoimmune hepatitis from systemic lupus erythematosus .



What the risks are:

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)



Review Date: 2/11/2013
Reviewed By: Ariel D. Teitel, MD, MBA, Clinical Associate Professor of Medicine, NYU Langone Medical Center. Review provided by VeriMed Healthcare Network. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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