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About the test
What is this test done for?
ASCA IgG is a blood test done for finding out presence of anti-Sacchromyces cerevisiae antibody in the blood.
Why is it Done?
This is a specialized test done for patients who are suffering from inflammatory bowel disease (IBD). This test helps in distinguishing Crohn’s disease from ulcerative colitis.
When should it be performed?
This test is performed when a patient presents with symptoms of inflammatory bowel disease and on
  • Loose motions
  • Passing blood in stools or passing black colored stools
  • Abdominal pain and cramps
  • Fever
  • Fatigue
  • Some patients may have symptoms of joint pains, skin and bone affections
  • In children, it can lead to malnutrition or growth retardation
How is it done
Venous blood sample is collected from vein at any time of the day, without any fasting
Negative, if levels are below 20 units/mL
  • Absence of Crohn’s disease
  • Ulcerative colitis
Weakly positive, if levels are 25-35 units/mL
  • Possibility of Crohn’s disease
Positive, if levels are above 35 units/mL
  • Crohn’s disease
  • Absence of ulcerative colitis
Other Tests
  • ANCA
    • This is a specialized blood test done for evaluating the presence of anti-neutrophil cytoplasmic antibodies
    • This test is also used in distinguishing ulcerative colitis from Crohn’s disease
    • Positive results indicate ulcerative colitis
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