Overview:

• Purpose: The ASCA-IgA test detects antibodies to Saccharomyces cerevisiae in the blood, which are often elevated in patients with Crohn's disease.
• Test Type: Immunoassay-based, detecting the level of specific antibodies in the blood.

Risk Assessment:

The ASCA-IgA test is minimally invasive, with risks primarily related to the blood draw itself, including:

• Bruising
• Infection
• Dizziness (rare)
• Fainting (rare).

Normal Range:

• The normal range for ASCA-IgA levels may vary depending on the laboratory and the assay used. Generally, values below a specific threshold (e.g., 20 U/mL) are considered normal.

  Typical Normal Range:

  • Negative: < 20 units/mL (depending on the laboratory)
  • Borderline: 20-40 units/mL
  • Positive: > 40 units/mL

  Results should be interpreted in the context of the patient's symptoms and other test results.

Interpretation:

• Positive Result: A high level of ASCA-IgA antibodies can suggest Crohn’s disease, particularly when paired with clinical symptoms and other diagnostic tests (e.g., imaging, endoscopy).
• Negative Result: A negative result does not rule out IBD. In some cases, particularly with ulcerative colitis, ASCA-IgA levels may not be elevated. It’s important to correlate the test with other clinical findings and lab results.

Sample Type:

• Blood sample: A venous blood sample is typically drawn for this test.