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Galactomannan (Aspergillus Antigen) Bronchoalveolar Lavage Test

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Galactomannan (Aspergillus Antigen) Bronchoalveolar Lavage Test

Short Name: Galactomannan BAL Test

Also known as: Galactomannan Test, Aspergillus Antigen BAL Test, GM BAL Test

Galactomannan (Aspergillus Antigen) Bronchoalveolar Lavage Test test available at DNA Labs India for ₹7,000. Uses Enzyme Immunoassay on Bronchoalveolar Lavage (BAL) fluid samples. Results in Same-day reporting for samples received on Tuesday, Thursday, or Saturday by 9 am.. Free home collection in 300+ cities across India.

Immunological Assay🏠 Home Collection

✍️ Written By

🩺 Medically Reviewed By

Dr Kothari Ramesh Shantilal

Dr Kothari Ramesh Shantilal

Consultant Microbiologist · Reg: 27670

Last reviewed: September 7, 2026

Overview

The primary purpose of the Galactomannan BAL test is to aid in the diagnosis of invasive aspergillosis and assess the response to antifungal therapy. It helps in early detection before life-threatening infection occurs, especially in high-risk populations.

Test Code
642
Price
₹7,000
Sample Type
Bronchoalveolar Lavage (BAL) fluid
Result Time
Same-day reporting for samples received on Tuesday, Thursday, or Saturday by 9 am.
Fasting Required
No
Method
Enzyme Immunoassay
Step 1

Sample Collection

No special preparation is required for the patient, but the procedure is performed by a trained physician in a clinical setting.

Method: Bronchoalveolar Lavage

Step 2

Laboratory Analysis

BAL fluid is collected via bronchoscopy, where a bronchoscope is inserted into the lungs to lavage a specific segment and retrieve fluid for analysis.

Step 3

Report Delivery

The collected sample is transferred to a sterile container and transported to the laboratory under refrigerated or frozen conditions to maintain stability.

Timeline: Same-day reporting for samples received on Tuesday, Thursday, or Saturday by 9 am.

Patient Instructions

1
Before the Test:No specific preparation required; patient undergoes bronchoscopy as scheduled by the physician.
2
During the Test:BAL fluid is collected via bronchoscopy, a minimally invasive procedure typically taking 15-30 minutes under local anesthesia.
3
After the Test:Patient may experience mild sore throat or cough; monitor for any complications and follow post-procedure instructions.

About This Test

Who Should Get This Test

The primary purpose of the Galactomannan BAL test is to aid in the diagnosis of invasive aspergillosis and assess the response to antifungal therapy. It helps in early detection before life-threatening infection occurs, especially in high-risk populations.

How to Prepare

  • Ensure aseptic technique during bronchoscopy to avoid contamination.
  • Label the sample container with patient details and time of collection.
  • Ship the sample refrigerated (2-8°C) or frozen (-20°C) as per stability guidelines.

Doctor's Notes

Reviewed by — MBBS, MD (Microbiology) · Reg. No. 27670

"Early detection of galactomannan in BAL fluid through this test is critical for initiating timely antifungal therapy in high-risk patients, significantly reducing mortality from invasive aspergillosis."

Last medically reviewed: September 7, 2026

Test Parameters & Specifications

Sample TypeBronchoalveolar Lavage (BAL) fluid
Sample Volume2 mL (1 mL min.)
ContainerSterile screw-capped container
Collection MethodBronchoalveolar Lavage

Sample Stability

Room Temperature: 8 hours
Refrigerator (2-8°C): 48 hours
Frozen (-20°C): 2 weeks
Sample Rejection Criteria:
  • Unlabeled or mislabeled samples
  • Insufficient sample volume (less than 1 mL)
  • Contaminated or hemolyzed samples
  • Samples stored beyond stability period

Understanding Your Results

Results are interpreted based on the galactomannan index level detected in BAL fluid, with cut-offs defined for clinical relevance.
Galactomannan Index < 0.5: Negative for Aspergillus antigen; low likelihood of invasive aspergillosis.
Galactomannan Index ≥ 0.5: Positive for Aspergillus antigen; suggestive of invasive aspergillosis and warrants further clinical evaluation.
Elevated levels in serial testing may indicate active infection or poor response to therapy.
Results should be correlated with clinical symptoms, imaging, and other diagnostic tests.
⚠️ When to Consult a Doctor:

Consult an infectious disease specialist immediately if the test is positive, symptoms persist or worsen, or if there is clinical suspicion of aspergillosis despite negative results.

Limitations

  • ⚠Not a standalone diagnostic tool; must be interpreted with clinical and imaging findings.
  • ⚠May yield false positives in patients with certain conditions or treatments.
  • ⚠Limited sensitivity in early stages of infection or non-invasive aspergillosis.
  • ⚠Requires bronchoscopy, which is an invasive procedure.

Risks & Considerations

  • ●Bleeding from the biopsy site
  • ●Infection at the insertion point
  • ●Pneumothorax (collapsed lung)
  • ●Adverse reaction to anesthesia

Interfering Factors

  • ●Cross-reactivity with other fungal species (e.g., Penicillium)
  • ●Certain antibiotics like piperacillin-tazobactam
  • ●Administration of immunoglobulin or plasma products
  • ●Sample contamination or improper handling

Compare With Similar Tests

TestGalactomannan (Aspergillus Antigen) Bronchoalveolar Lavage TestSerum Galactomannan TestAspergillus PCR TestSputum Culture for FungiChest CT Scan
ComparisonGalactomannan (Aspergillus Antigen) Bronchoalveolar Lavage Test

Frequently Asked Questions

What is the Galactomannan (Aspergillus Antigen) Bronchoalveolar Lavage Test?
It is a diagnostic test that detects galactomannan, a component of Aspergillus fungi, in fluid from the lungs to diagnose invasive aspergillosis.
Why is this test important for diagnosing Aspergillosis?
Early detection allows for timely antifungal therapy, which can prevent life-threatening complications, especially in immunocompromised patients.
How is the BAL fluid sample collected?
BAL fluid is collected via bronchoscopy, a procedure where a thin tube is inserted into the lungs to wash and retrieve fluid for analysis.
What does a positive result indicate?
A positive result (index ? 0.5) suggests the presence of Aspergillus antigen and is indicative of invasive aspergillosis, requiring further clinical evaluation.
Are there any risks associated with the BAL procedure?
Risks include bleeding, infection, pneumothorax, or reactions to anesthesia, though these are uncommon when performed by experienced professionals.
How long does it take to get the results?
Results are typically available the same day for samples received on Tuesday, Thursday, or Saturday by 9 am.
Is special preparation required before the test?
No special preparation is needed, but the procedure is done in a clinical setting; follow your physician's instructions.
What is the cost of the test at DNA Labs India?
The test costs INR 7000, and free home sample collection is not available for this test due to the invasive nature of BAL.
Is home sample collection available for this test?
No, home collection is not feasible as BAL requires bronchoscopy, which must be performed in a hospital or clinic by a trained physician.
What are the normal reference ranges for galactomannan?
A galactomannan index below 0.5 is considered negative, while 0.5 or above is positive for Aspergillus antigen.
How accurate is the test in detecting invasive aspergillosis?
The test is highly specific when combined with clinical context, but may have false positives; it is part of a comprehensive diagnostic approach.
When should I consult a doctor after getting the test results?
Consult an infectious disease specialist immediately if the test is positive, or if symptoms persist, to discuss further management and treatment options.
Worried about the process? Our certified phlebotomists collect thousands of samples every month across India. The process takes under 5 minutes and is virtually painless. Questions? Message us on WhatsApp — we're here 7 days a week.

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