Aspergillus IgG Test

The Aspergillus IgG test detects IgG antibodies against Aspergillus fumigatus, a common fungal species. This test helps diagnose chronic and invasive Aspergillus infections, particularly chronic pulmonary aspergillosis (CPA) and aspergilloma (fungal ball).

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Why is the Aspergillus IgG Test Done?

✅ To Diagnose Chronic Pulmonary Aspergillosis (CPA)

• High Aspergillus IgG levels are a key marker of CPA, which occurs in people with lung conditions like tuberculosis (TB), COPD, sarcoidosis, or bronchiectasis.

✅ To Detect Aspergilloma (Fungal Ball in the Lungs)

• Aspergillomas develop in lung cavities from previous infections (e.g., TB, emphysema, cystic fibrosis).

✅ To Monitor Aspergillus Infections Over Time

• Used to track chronic infections and treatment response.

✅ To Differentiate Chronic vs. Allergic Aspergillus Diseases

• High IgG suggests chronic infection, while high IgE suggests an allergic reaction (ABPA).

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Test Procedure

🩸 Blood Sample Collection:

• A blood sample is drawn from a vein.
• No fasting required.
• Results available in 3–7 days.

🔬 Method Used:

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

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Normal Range & Interpretation

🔹 A positive Aspergillus IgG alone does not confirm CPA – further tests are required.
🔹 A significant increase in IgG over time suggests an active infection.

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What Do Abnormal Aspergillus IgG Test Results Mean?

🔴 High Aspergillus IgG Levels Suggest:

• Chronic Pulmonary Aspergillosis (CPA) – Common in individuals with pre-existing lung conditions.
• Aspergilloma (Fungal Ball) – Associated with lung cavities from old infections.
• Invasive Aspergillosis (In Severe Cases) – Seen in immunocompromised patients.
• Past Exposure to Aspergillus – Previous infection, but no active disease.

🟢 Normal or Low Aspergillus IgG Levels:

• Unlikely to have chronic Aspergillosis.
• Other lung infections (e.g., tuberculosis, bacterial pneumonia) should be considered.

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Next Steps If Aspergillus IgG Is High?

🔬 Additional Tests for Confirmation:

• Chest CT Scan or X-ray – Identifies lung cavities, fungal balls, or chronic infection.
• Sputum Culture or PCR – Confirms Aspergillus presence in the lungs.
• Aspergillus Galactomannan Test – Detects invasive aspergillosis.
• Total IgE & Aspergillus IgE Test – Helps differentiate CPA vs. ABPA.

✅ Treatment Options If Chronic Aspergillosis Is Confirmed:

• Antifungal Medications – Itraconazole or voriconazole are commonly used.
• Surgical Removal (For Aspergilloma) – If symptoms are severe or life-threatening.
• Corticosteroids (If Allergic Component Present) – Reduces inflammation in ABPA with secondary CPA.
• Oxygen Therapy & Pulmonary Rehabilitation – Helps in chronic lung disease cases.

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Key Takeaways

🔹 Aspergillus IgG is a marker for chronic Aspergillus infections (CPA, aspergilloma).
🔹 High levels indicate a chronic lung infection but require further confirmation.
🔹 Often found in people with pre-existing lung diseases (TB, COPD, cystic fibrosis).
🔹 Treatment includes antifungals, surgery (if needed), and lung function support.