Anti-Saccharomyces cerevisiae Antibodies (ASCA)
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- Also Known As:
- Anti-Saccharomyces cerevisiae mannan antibodies
- ASCA
- Formal Name:
- Saccharomyces cerevisiae Antibodies
- IgG or IgA

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At a Glance
Why Get Tested?
To help distinguish between Crohn disease (CD) and ulcerative colitis (UC), the two most common types of inflammatory bowel disease (IBD), which is a group of chronic disorders marked by swollen and damaged tissues in the lining of the intestinal tract
When To Get Tested?
When you have symptoms such as persistent or intermittent diarrhea and abdominal pain that your healthcare practitioner suspects may be due to an IBD; when your healthcare practitioner wants to distinguish between CD and UC
Sample Required?
A blood sample drawn from a vein in your arm
Test Preparation Needed?
None
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The reference ranges for your tests can be found on your laboratory report. They are typically found to the right of your results.
If you do not have your lab report, consult your healthcare provider or the laboratory that performed the test(s) to obtain the reference range.
Laboratory test results are not meaningful by themselves. Their meaning comes from comparison to reference ranges. Reference ranges are the values expected for a healthy person. They are sometimes called “normal” values. By comparing your test results with reference values, you and your healthcare provider can see if any of your test results fall outside the range of expected values. Values that are outside expected ranges can provide clues to help identify possible conditions or diseases.
While accuracy of laboratory testing has significantly evolved over the past few decades, some lab-to-lab variability can occur due to differences in testing equipment, chemical reagents, and techniques. This is a reason why so few reference ranges are provided on this site. It is important to know that you must use the range supplied by the laboratory that performed your test to evaluate whether your results are “within normal limits.”
For more information, please read the article Reference Ranges and What They Mean.
What is being tested?
Anti-Saccharomyces cerevisiae antibodies (ASCA) are immune proteins that are frequently present in people who have inflammatory bowel disease (IBD), a group of chronic disorders, thought to be due to an autoimmune process, marked by swollen and damaged tissues in the lining of the intestinal tract. This test detects ASCA in the blood.
S. cerevisiae are common yeast found in various foods. The correlation between the presence of antibodies to S. cerevisiae and their involvement in the inflammatory bowel disease process is not understood at this time.
The symptoms and severity of IBD vary from person to person and may fluctuate over time. Many of those affected experience flare-ups followed by periods of lessened symptoms or even remission. The two most common types of IBD are Crohn disease (CD) and ulcerative colitis (UC). CD can affect any part of the intestinal tract, from mouth to anus, but is primarily found in the small intestine and/or in the colon, while UC occurs in the colon.
The diagnosis of CD or UC is usually made on the basis of endoscopic testing and the examination of biopsy samples from the intestines. Because both CD and UC can be found in the colon, even using biopsies it can sometimes be difficult to distinguish between the two. When this occurs, ASCA testing may be helpful as ASCA is much more frequently found in people with CD than in those with UC.
There are two classes of Saccharomyces cerevisiae antibodies produced by the body, ASCA IgG and ASCA IgA. Testing usually includes both classes. ASCA IgG may predict the severity of the disease and the need for surgery as a treatment option.
Common Questions
View Sources
Sources Used in Current Review
(2018 March 22, Updated). Inflammatory bowel disease (IBD). Centers for Disease Control and Prevention. Available online at https://www.cdc.gov/ibd/what-is-ibd.htm. Accessed on 10/05/18.
Ghazi, L. (2017 January 6, Updated). Crohn Disease. Medscape Gastroenterology. Available online at https://emedicine.medscape.com/article/172940-overview. Accessed on 10/05/18.
Rowe, W. and Lichtenstein, G. (2017 October 18, Updated). Inflammatory Bowel Disease. Medscape Gastroenterology. Available online at https://emedicine.medscape.com/article/179037-overview. Accessed on 10/05/18.
Couturier, M. et. al. (2018 July, Updated). Inflammatory Bowel Disease – IBD. ARUP Consult. Available online at https://arupconsult.com/content/inflammatory-bowel-disease. Accessed on 10/05/18.
Wang, Z. et. al. (2017 April 6). Serologic testing of a panel of five antibodies in inflammatory bowel diseases: Diagnostic value and correlation with disease phenotype. Biomed Rep. 2017 Apr;6(4):401-410. doi: 10.3892/br.2017.860. Epub 2017 Feb 17. Available online at https://www.ncbi.nlm.nih.gov/pubmed/28413638. Accessed on 10/05/18.
(© 1995–2018). Inflammatory Bowel Disease Serology Panel, Serum. Mayo Clinic Mayo Medical Laboratories. Available online at https://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/81443. Accessed on 10/05/18.
Sources Used in Previous Reviews
Ananthakrishnan, A. (2013). Personalizing Therapy for Inflammatory Bowel Diseases. Medscape Multispecialty from Expert Rev Gastroenterol Hepatol. 2013;7(6):549-558. [On-line information]. Available online at http://www.medscape.com/viewarticle/810751. Accessed March 2014.
Ghazi, L. (Updated 2014 January 13). Crohn Disease. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/172940-overview. Accessed March 2014.
Rowe, W. and Lichtenstein, G. (Updated 2013 November 25). Inflammatory Bowel Disease. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/179037-overview. Accessed March 2014.
Grossman, A. and Mamula, P. (Updated 2013 October 14). Pediatric Crohn Disease. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/928288-overview. Accessed March 2014.
Basson, M. (Updated 2013 May 27). Ulcerative Colitis. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/183084-overview. Accessed March 2014.
(Updated 2013 December 17). Anti-Saccharomyces Cerevisiae Antibodies, IgA and IgG. The University of Iowa Department of Pathology LABORATORY SERVICES HANDBOOK [On-line information]. Available online at http://www.healthcare.uiowa.edu/path_handbook/handbook/test1155.html. Accessed March 2014.
Minerva, P. (Updated 2012 March 29). Enteropathic Arthropathies. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/334746-overview. Accessed March 2014.
Walfish, A. and Sachar, D. (Revised 2012 December). Crohn Disease. Merck Manual for Healthcare Professionals [On-line information]. Available online through http://www.merckmanuals.com. Accessed March 2014.
(Updated 2014 February). Inflammatory Bowel Disease – IBD. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/IBD.html?client_ID=LTD#tabs=0. Accessed March 2014.
Ryan, J. D. et. al. (2013). Predicting Complicated Crohn’s Disease and Surgery. Medscape Multispecialty from Aliment Pharmacol Ther. 2013;38(3):274-283. [On-line information]. Available online at http://www.medscape.com/viewarticle/807728. Accessed March 2014.
(© 1995–2014). Saccharomyces cerevisiae Antibody, IgG, Serum. Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/83023. Accessed March 2014.
(2011 December). Crohn’s Disease. National Digestive Diseases Information Clearinghouse (NDDIC) [On-line information]. Available online at http://digestive.niddk.nih.gov/ddiseases/pubs/crohns/. Accessed March 2014.
(Updated 2011 April 30). Diagnosing and Managing IBD. Crohn’s & Colitis Foundation of America [On-line information]. Available online at http://www.ccfa.org/resources/diagnosing-and-managing-ibd.html. Accessed March 2014.
Yau, Y. et. al. (2013). Proteomics and Metabolomics in Inflammatory Bowel Disease. Medscape Multispecialty from J Gastroenterol Hepatol. 2013;28(7):1076-1086. [On-line information]. Available online at http://www.medscape.com/viewarticle/807024. Accessed March 2014.
Kuna, A. (2013 February). Serological markers of inflammatory bowel disease. Biochem Med (Zagreb). Feb 2013; 23(1): 28–42. [On-line information]. Available online at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3900099/. Accessed March 2014.
Wu, A. (© 2006). Tietz Clinical Guide to Laboratory Tests, 4th Edition: Saunders Elsevier, St. Louis, MO. Pp 966-967.
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