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Anti-Saccharomyces Cerevisiae Antibody (ASCA) IgG

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Anti-Saccharomyces Cerevisiae Antibody (ASCA) IgG Test

The ASCA IgG test detects Anti-Saccharomyces Cerevisiae Antibodies (ASCA) in the blood. It is primarily used to help diagnose inflammatory bowel disease (IBD), particularly Crohn’s disease (CD), and to distinguish it from ulcerative colitis (UC).

Why is the ASCA IgG Test Done?

✅ To Diagnose Crohn’s Disease (CD)

  • ASCA IgG is positive in ~60–70% of Crohn’s disease cases.
  • Helps differentiate Crohn’s disease from ulcerative colitis (UC).

✅ To Assess Disease Severity & Risk of Complications

  • Higher ASCA levels may indicate severe disease or risk of complications (e.g., fistulas, strictures).

✅ To Guide Treatment Decisions

  • Helps doctors determine whether to use immunosuppressants, biologics, or surgery.

✅ To Differentiate IBD from Other Digestive Disorders

  • ASCA is typically negative in IBS, celiac disease, and other non-IBD conditions.

Test Procedure

🩸 Blood Sample Collection:

  • A blood sample is drawn from a vein.
  • No fasting required.
  • Results available in 2–5 days.

🔬 Methods Used:

  • Enzyme-Linked Immunosorbent Assay (ELISA)
  • Immunofluorescence Assay (IFA)

Normal Range & Interpretation

Result ASCA IgG Level Interpretation
Negative < 12 U/mL No ASCA antibodies detected
Borderline 12–20 U/mL Possible early Crohn’s disease
Positive > 20 U/mL Suggestive of Crohn’s disease

🔹 A positive ASCA IgG alone does not confirm Crohn’s disease – additional tests are needed.
🔹 A positive ASCA IgG & IgA strongly suggests Crohn’s disease.

What Do Abnormal ASCA IgG Test Results Mean?

🔴 Positive ASCA IgG Suggests:

  • Crohn’s Disease (CD) – Strong association, especially with ASCA IgA positivity.
  • Fungal Exposure – ASCA reacts to Saccharomyces cerevisiae (baker’s yeast) but is uncommon in healthy individuals.
  • Other Inflammatory Conditions (Rarely) – May be seen in some cases of celiac disease or autoimmune disorders.

🟢 Negative ASCA IgG:

  • Ulcerative colitis (UC) is more likely (ASCA is rarely positive in UC).
  • Other non-IBD conditions (IBS, celiac disease, infections).

Next Steps If ASCA IgG Is Positive?

🔬 Additional Tests for Confirmation:

  • ASCA IgA Test – IgA & IgG positivity together increases Crohn’s disease likelihood.
  • pANCA (Perinuclear Anti-Neutrophil Cytoplasmic Antibody) Test – pANCA positive in UC, negative in CD.
  • Fecal Calprotectin & Lactoferrin – Evaluate active gut inflammation.
  • Endoscopy & Colonoscopy – Direct visualization and biopsy confirmation.

✅ Treatment Options If Crohn’s Disease Is Confirmed:

  • Dietary Changes – Avoid trigger foods, follow an anti-inflammatory diet.
  • Medications – Aminosalicylates, corticosteroids, biologics (TNF inhibitors), or immunosuppressants.
  • Lifestyle Modifications – Manage stress, gut microbiome support, probiotics.
  • Surgery (If Severe) – In some cases, bowel resection may be necessary.

Key Takeaways

🔹 ASCA IgG is a marker for Crohn’s disease, especially when IgA is also positive.
🔹 Helps differentiate Crohn’s from ulcerative colitis and IBS.
🔹 Not a standalone diagnostic test – endoscopy and other markers are needed.
🔹 Used for early detection, risk assessment, and treatment planning.