Aspergillus galactomannan, Bronchoalveolar Test: Booking, Price, and Results
About Aspergillus galactomannan, Bronchoalveolar Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | BAL GM test, Aspergillus antigen BAL, Galactomannan EIA BAL, BALF GM assay |
| Sample Type | Bronchoalveolar lavage (BAL) fluid, a lung wash fluid collected via bronchoscopy |
| Fasting Required | Yes, typically 6 to 8 hours before the bronchoscopy procedure |
| Report Time | 1 Day |
| Recommended For | Both genders, all ages; primarily for immunocompromised individuals at risk of invasive aspergillosis |
| Price | Starting at ₹5,500 |
What is an Aspergillus galactomannan, Bronchoalveolar Test?
The Aspergillus galactomannan, bronchoalveolar test detects a specific substance released by Aspergillus fungi in fluid collected directly from the lungs. It is used to identify invasive fungal infections, particularly in patients with weakened immune systems. Also known as the BAL GM test or BALF GM assay, this test analyses a bronchoalveolar lavage (BAL) fluid sample, collected through a hospital procedure called bronchoscopy.
What Does an Aspergillus galactomannan, Bronchoalveolar Test Measure?
This test looks for two key indicators of Aspergillus infection in lung fluid. The table below explains what each one tells us.
| Parameter | What it Means |
|---|---|
| Galactomannan (GM) | A complex carbohydrate found in the Aspergillus cell wall; its presence in lung fluid signals active fungal infection |
| Optical Density Index (ODI) | The test result expressed as a number, calculated by comparing the sample's reading against a reference control |
Why is an Aspergillus galactomannan, Bronchoalveolar Test Done?
Doctors order this test when a patient shows respiratory symptoms that do not respond to standard treatments and a fungal infection is suspected. The Aspergillus galactomannan bronchoalveolar test is particularly useful in patients whose immune systems are not functioning normally.
Common Symptoms That May Require This Test
The following symptoms, especially in immunocompromised individuals, may prompt a doctor to order this test.
- Persistent unexplained fever that does not subside with antibiotics
- Cough, sometimes with blood (haemoptysis)
- Chest pain or tightness
- Shortness of breath (dyspnoea)
- Unexplained weight loss
- Respiratory distress not responding to standard treatment
Conditions This Test Can Help Detect
This test can help identify several serious fungal conditions, including the following.
- Invasive pulmonary aspergillosis (IPA), for which this test is considered a gold standard diagnostic tool
- Invasive aspergillosis in organ transplant recipients and patients with prolonged neutropenia (very low white blood cell counts)
- Aspergillosis in patients receiving immunosuppressive therapy
- Chronic pulmonary aspergillosis
Aspergillus galactomannan, Bronchoalveolar Test for Chronic Disease Monitoring
Galactomannan levels in BAL fluid can be tracked over time to assess how well antifungal treatment is working. As the infection responds to therapy, galactomannan levels generally decline. Patients at high risk of invasive aspergillosis may require periodic testing to monitor for early signs of infection or treatment response.
How to Prepare and What to Expect
Preparation is important for this test because it involves a bronchoscopy procedure, not a simple blood draw. Following your doctor's instructions carefully will help ensure a safe procedure and reliable results.
Do You Need to Fast?
Yes. You must not eat or drink anything for 6 to 8 hours before the bronchoscopy procedure. This is necessary to reduce the risk of complications during sedation.
Practical Tips Before Your Test
The following steps will help you prepare safely and get accurate results.
- Bring a detailed clinical history, including your symptoms, previous test results, and family history, as this is required for the test
- Avoid foods such as rice and pasta before the test, as these foods contain galactomannan and may affect results; discuss your diet with your doctor beforehand
- Tell your doctor about all medications you are taking, especially antibiotics such as piperacillin-tazobactam or amoxicillin, which can interfere with results
- Inform your doctor of any allergies or breathing conditions, such as asthma
- If you are receiving intravenous fluid called PLASMA-LYTE, inform your doctor; you must be off it for at least 3 days before sample collection to avoid false-positive results
Step-by-Step Procedure
The BAL sample is collected during a bronchoscopy, carried out by a pulmonologist (lung specialist) in a hospital setting. Here is what to expect.
- Before the procedure begins, you will be given a sedative. Most patients are asleep or very drowsy throughout.
- A local anaesthetic is applied to prevent coughing and discomfort. A thin, flexible tube called a bronchoscope is then gently passed through your nose or mouth into your lungs.
- The pulmonologist uses the bronchoscope to rinse a small area of your lungs with a sterile saltwater solution.
- The saline solution, now carrying cells and lung fluid, is gently suctioned back through the tube into a sterile container.
- The collected BAL fluid (5 ml) is sealed in a sterile container and stored at 2 to 8°C for transport to the laboratory.
- At the laboratory, the sample is tested using the enzyme immunoassay (EIA) method to detect galactomannan levels.
Factors That Can Affect Accuracy
Several factors may influence the reliability of this test's results.
- Use of antifungal medications before the test may reduce the test's sensitivity
- Blood present in the BAL sample can cause false-positive readings, particularly in samples with low protein levels
- Certain antibiotics, especially piperacillin-tazobactam, may produce false-positive results
- Use of PLASMA-LYTE intravenous fluid within 3 days of the test may lead to false-positive results
- Very early infection may not yet produce detectable galactomannan levels
Understanding Your Aspergillus galactomannan, Bronchoalveolar Test Results
Results from this test are expressed as an index value (ODI) and must always be reviewed by your doctor alongside your clinical history and other investigations. The table below shows what different index values generally indicate.
| Result | ODI Value | Interpretation |
|---|---|---|
| Negative | Less than 0.5 | Invasive aspergillosis is unlikely |
| Equivocal / Low Positive | 0.5 to less than 1.0 | Borderline; repeat testing or further investigation may be needed |
| Positive | 1.0 or above | Suggests invasive aspergillosis; further diagnostic confirmation is needed |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain medical situations can affect what the test results mean. Your doctor will take these into account when interpreting your report.
- Patients receiving piperacillin-tazobactam may show false-positive results; this effect may be reduced with newer antibiotic formulations
- Foods such as pasta and rice contain galactomannan; gut damage from chemotherapy, radiation, or graft-versus-host disease can allow galactomannan from food to enter the bloodstream, causing false-positive readings
- Patients with chronic granulomatous disease or hyper-IgE syndrome (Job syndrome) may show reduced galactomannan detection, leading to false-negative results
- Use of PLASMA-LYTE for intravenous hydration or BAL collection has been linked to false-positive galactomannan results
How to Maintain Healthy Levels
These general tips support respiratory health and reduce infection risk, particularly for those with weakened immune systems.
- Avoid environments with high mould or dust exposure if your immune system is compromised
- Follow any antifungal preventive treatment (prophylaxis) prescribed by your doctor
- Report persistent fever, cough, or breathing difficulties to your doctor promptly so that investigation can begin without delay
Lupin Diagnostics Aspergillus galactomannan, Bronchoalveolar Test Price
The Aspergillus galactomannan, bronchoalveolar test is priced starting at ₹5,500 at Lupin Diagnostics. This test requires a visit to a hospital or Lupin Diagnostics centre for sample collection, as the BAL sample must be obtained via bronchoscopy by a qualified specialist. Home collection is not available for this test.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | 5500 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
You can book the Aspergillus galactomannan bronchoalveolar test online by following these steps.
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred centre location.
- Visit the centre at your scheduled time for sample collection.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
This test detects a substance called galactomannan in lung fluid to help diagnose invasive aspergillosis, a serious fungal infection. It is mainly used for patients with weakened immune systems who show respiratory symptoms not responding to standard antibiotics. The BAL GM test is considered a key tool for diagnosing invasive pulmonary aspergillosis.
This test is recommended for immunocompromised individuals, such as those undergoing chemotherapy, bone marrow or organ transplantation, or those with prolonged neutropenia (very low white blood cell counts). Any high-risk patient with persistent unexplained fever or respiratory symptoms may be referred for this investigation.
The sample is collected during a bronchoscopy procedure performed in a hospital by a lung specialist. A thin, flexible tube is guided into the lungs, saline solution is used to wash a small area, and the fluid is then collected for laboratory testing. Most patients are sedated and comfortable throughout the procedure.
No. The Aspergillus galactomannan, bronchoalveolar test cannot be done at home. The sample requires a bronchoscopy procedure, which must be carried out in a hospital or clinical centre by a trained pulmonologist.
A positive result indicates the presence of galactomannan antigen in the lung fluid, which suggests an active Aspergillus infection may be present. Your doctor will confirm the diagnosis using additional tests such as cultures, imaging, or biopsy before deciding on a course of action.
Yes. Certain antibiotics, particularly piperacillin-tazobactam, and intravenous fluids such as PLASMA-LYTE can cause false-positive results. Antifungal medications taken before the test may reduce the test's ability to detect the infection. Always tell your doctor about all medicines you are taking before the test.
At Lupin Diagnostics, the report is typically available within 1 day of the sample being received at the laboratory. Your report will be sent to you digitally via email or WhatsApp.
Aspergillus galactomannan, Bronchoalveolar Test: Booking, Price, and Results
