AMA

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Também chamado: Mitochondrial Antibody
Nome formal: Antimitochondrial Antibody and Antimitochondrial M2 Antibody
Exames relacionados: Antineutrophil cytoplasmic antibody (ANCA), Liver/Kidney microsomal antibody, Alkaline phosphatase (ALP), Alanine aminotransferase (ALT), Liver panel, Smooth muscle antibody (SMA), Antinuclear antibody (ANA)

De relance

Por que fazer este exame?

To help diagnose primary biliary cirrhosis (PBC)

Quando fazer este exame?

When a doctor suspects that a person may have PBC

Amostra:

A blood sample drawn from a vein in your arm

A amostra

O que está sendo pesquisado?

This test measures the amount of antimitochondrial antibodies (AMA) present in the blood. The increased production of AMA is strongly associated with primary biliary cirrhosis (PBC). PBC is an autoimmune disorder that causes inflammation and scarring of the bile ducts inside the liver, causing progressive hepatic destruction and blockage of the bile flow. It is found most frequently in women between the ages of 35 and 60. More than 90% of those affected by PBC will have significant concentrations of antimitochondrial antibodies.

Increased AMA levels are also seen in primary and secondary sclerosing cholangitis, liver disease due to chronic inflammatory bowel disease, and bile duct obstruction. In addition, elevated serum alkaline phosphatase levels can also be present.

There are nine types of AMA antigens (M1 – M9) of which M2 and M9 are the most clinically significant. The presence of the M2 type has been particularly evident in PBC, while the other antigen types may be found in other conditions. Some laboratories have started to offer the AMA-M2 instead of the AMA, which tests for all types together.

For more information on PBC and primary sclerosing cholangitis, click on the Links tab and see related links listed under Elsewhere on the Web.

Como a amostra é obtida para o exame?

A blood sample is obtained by inserting a needle into a vein in the arm.

NOTA: Se exames médicos em você ou em alguém importante para você o deixam ansioso ou constrangido, ou se você tem dificuldade de lidar com eles, leia um ou mais dos seguintes artigos: Lidando com dor, desconforto ou ansiedade durante o exame, Conselhos sobre exames de sangue, Conselhos para ajudar crianças durante exames médicos, and Conselhos para ajudar idosos durante exames médicos.

Outro artigo, Siga essa amostra, fornece uma visão da coleta e do processamento de uma amostra de sangue e de uma amostra de cultura da garganta.

É necessário algum preparo para garantir a qualidade da amostra?

No test preparation is needed.

O exame

Perguntas frequentes

Pergunte ao laboratório

* indica um campo necessário



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Fontes do artigo

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NOTA: Este artigo se baseia em pesquisas que incluíram as fontes citadas e a experiência coletiva de Lab Tests Online Conselho de Revisão Editorial. Este artigo é submetido a revisões periódicas do Conselho Editorial, e pode ser atualizado como resultado dessas revisões. Novas fontes citadas serão adicionadas à lista e distinguidas das fontes originais usadas.

Sources Used in Current Review

Pagana, Kathleen D. & Pagana, Timothy J. (© 2007). Mosby’s Diagnostic and Laboratory Test Reference 8th Edition: Mosby, Inc., Saint Louis, MO. Pp 85-86.

Clarke, W. and Dufour, D. R., Editors (© 2006). Contemporary Practice in Clinical Chemistry: AACC Press, Washington, DC. Pp 272.

Wu, A. (© 2006). Tietz Clinical Guide to Laboratory Tests, Fourth Edition: Saunders Elsevier, St. Louis, MO. Pp 746.

Dugdale, D. (Updated 2008 November 2). Autoimmune liver disease panel. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003328.htm. Accessed 1/29/09.

Christopher-Stine, L. (Updated 2006 August 22). Systemic lupus erythematosus. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/000435.htm. Accessed 1/29/09.

Lehrer, J (2006 July 25 Updated). Autoimmune hepatitis. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/000245.htm. Accessed 1/29/09.

Stone, C. (2008 May 20, Updated). Primary biliary cirrhosis. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/000282.htm. Accessed 1/29/09.

Hill, H. (Updated 2008 September). Primary Biliary Cirrhosis. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/AutoimmuneDz/PBC.html# through http://www.arupconsult.com. Accessed 1/29/09.

Bylund DJ, Nakamura RM. Organ-specific autoimmune diseases. Henry’s Clinical Diagnosis and Laboratory Management, 21st ed., 2007. Pp 945-960.

Sources Used in Previous Reviews

Thomas, Clayton L., Editor (1997). Taber’s Cyclopedic Medical Dictionary. F.A. Davis Company, Philadelphia, PA [18th Edition].

Pagana, Kathleen D. & Pagana, Timothy J. (2001). Mosby’s Diagnostic and Laboratory Test Reference 5th Edition: Mosby, Inc., Saint Louis, MO. Pp 82-83.

Lindor, K. (© 2002-2003) What is Primary Biliary Cirrhosis (PBC)? American Liver Foundation [On-line information]. Available online at http://www.liverfoundation.org/db/articles/1014 through http://www.liverfoundation.org.

(© 1995-2005). Primary Biliary Cirrhosis. The Merck Manual of Medical Information – Second Home Edition [On-line information]. Available online at http://www.merck.com/mmhe/print/sec10/ch136/ch136d.html through http://www.merck.com.

(© 1995-2005). Primary Sclerosing Cholangitis. The Merck Manual of Medical Information – Second Home Edition [On-line information]. Available online at http://www.merck.com/mmhe/sec10/ch136/ch136e.html through http://www.merck.com.

(© 2005). Mitochondrial M2 Antibody, IgG (ELISA). ARUP's Guide to Clinical Laboratory Testing [On-line information]. Available online at http://www.arup-lab.com/guides/clt/tests/clt_a89b.jsp#1142095 through http://www.arup-lab.com.

Beuers, U. and Rust, C. (2005 October 27). Overlap Syndromes. Medscape, from Semin Liver Dis. 2005; 25(3): 311-320. [On-line information]. Available online at http://www.medscape.com/viewarticle/512463 through http://www.medscape.com.

Stone, C. (2004 November 10, Updated). Autoimmune liver disease panel. Medline Plus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003328.htm.

Stone, C. (2004 May 14). Primary biliary cirrhosis. Medline Plus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/000282.htm.

Peng, S. (2005 April 20). Antimitochondrial antibody. Medline Plus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003529.htm.

(© 2003). Mitochondrial (M2) Antibody. LabCorp [On-line test information]. Available online at http://www.labcorp.com/datasets/labcorp/html/chapter/mono/se000750.htm through http://www.labcorp.com.