Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test
About Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test
| Field | Value |
|---|---|
| Also Known As | Anti-GBM Antibody Test, GBM Antibody Test, Glomerular Basement Membrane Antibody Test, Anti-Glomerular Basement Membrane IgG Test |
| Sample Type | Serum (venous blood) |
| Fasting Required | No fasting required |
| Report Time | 1 day |
| Recommended For | Adults of all ages; males and females |
| Price | Starting at ₹1,200 |
What is an Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test?
The anti glomerular basement membrane IgG antibody (anti GBM) test is a blood test that detects specific autoantibodies in the body. Autoantibodies are immune proteins that mistakenly attack the body's own tissues. In this case, they target the thin layers of tissue lining the kidneys and lungs, known as basement membranes.
Doctors order this test when a patient shows signs of kidney or lung damage that may be caused by an autoimmune condition. It is also known as the anti-GBM antibody test, GBM antibody test, glomerular basement membrane antibody test, or anti-glomerular basement membrane IgG test. A small blood sample (serum) is used for the analysis.
What Does an Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test Measure?
This test measures a single but clinically significant marker. The result helps doctors confirm or rule out a specific autoimmune condition. Here is what the test analyses:
| Parameter | What It Measures |
|---|---|
| Anti-GBM IgG Antibody | Detects autoantibodies that bind to type IV collagen in the kidney and lung basement membranes, signalling possible autoimmune damage to these tissues |
Why is an Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test Done?
This test is ordered when a doctor suspects an autoimmune condition affecting the kidneys or lungs. It is used both for initial diagnosis and for tracking treatment response.
Common Symptoms That May Require This Test
The following symptoms may prompt a doctor to request this test:
- Coughing up blood (haemoptysis)
- Difficulty breathing (dyspnoea)
- Blood in urine (haematuria)
- Unexplained fatigue
- Chest pain
- Anaemia (low red blood cell count)
- Rapidly declining kidney function
Conditions This Test Can Help Detect
This test can help identify several conditions involving the kidneys and lungs. These include:
- Goodpasture syndrome (anti-GBM disease), a rare autoimmune disorder where antibodies attack kidney and lung tissue
- Rapidly progressive glomerulonephritis, a condition involving swift and severe kidney inflammation
- Pulmonary haemorrhage, which refers to bleeding into the lungs
- Glomerulonephritis, an inflammation of the glomeruli (the tiny filtering units in the kidneys)
How to Prepare and What to Expect
No special preparation is needed before this test. The steps below will help you know what to expect on the day.
Do You Need to Fast?
No, fasting is not required. You can eat and drink as normal before your appointment. If other tests are ordered alongside this one, ask your doctor whether any of those require fasting.
Practical Tips Before Your Test
A few simple steps will help ensure a smooth experience and accurate results:
- Bring a detailed clinical history, including your symptoms, previous test results, and any relevant medical records, as this is required for the test
- Inform your doctor about all medications you are currently taking, especially immunosuppressants
- Tell your doctor if you have recently undergone plasmapheresis (blood plasma exchange), as this can affect your results
- Wear a short-sleeved shirt or clothing with sleeves that can be easily rolled up
- Stay well hydrated before the test to make the blood draw easier
Step-by-Step Procedure
Here is what to expect during the anti glomerular basement membrane IgG antibody test procedure:
- A trained phlebotomist (blood collection specialist) cleans the skin at the inner elbow with an antiseptic solution.
- A tourniquet is applied to the upper arm to make the vein more visible.
- A small blood sample is drawn using a standard needle and collected in a serum separator tube (a yellow-capped tube).
- The sample is processed to separate the serum (the liquid portion of blood), which is then transferred into a plastic vial.
- A small bandage is placed over the puncture site; you can resume normal activities immediately.
- The sample is stored at refrigerated temperatures and sent to the laboratory for analysis using the EIA (enzyme immunoassay) method.
Factors That Can Affect Accuracy
Certain factors may influence the reliability of your results:
- Recent use of immunosuppressant medications, which may reduce antibody levels
- Recent plasmapheresis treatment, which can lower antibody concentrations and lead to a false-negative result
- Exposure to bovine serum albumin (BSA)-containing surgical adhesives, which may cause a false-positive result with some testing methods
- Timing of sample collection relative to when symptoms began
- Improper handling or storage of the specimen during transport
Understanding Your Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test Results
Results from this test should always be reviewed alongside your full clinical picture. The table below shows general reference values:
| Parameter | Result | Interpretation |
|---|---|---|
| Anti-GBM Antibody IgG | Less than 1.0 U | Negative (no antibodies detected) |
| Anti-GBM Antibody IgG | 1.0 U or above | Positive (antibodies detected) |
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
- If you have already started immunosuppressant therapy or had plasmapheresis before the test, a negative result may not fully exclude anti-GBM disease, as treatment can reduce antibody levels.
- Exposure to certain surgical adhesives may cause a false-positive reading with some immunoassay methods. Your doctor will consider this when interpreting results.
- In some patients with anti-GBM disease, another type of antibody called ANCA (antineutrophil cytoplasmic antibody) is also present. Your doctor may order additional tests accordingly.
How to Maintain Healthy Levels
These are general wellness tips for people managing or at risk of anti-GBM-related conditions:
- Avoid smoking, as it has been linked to lung bleeding in people with Goodpasture syndrome
- Reduce exposure to metal dust and petroleum-based chemicals such as paint thinner or fuel fumes
- Keep all scheduled follow-up appointments if you have been diagnosed with anti-GBM disease
Lupin Diagnostics Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test Price and Home Collection
The anti glomerular basement membrane IgG antibody test cost at Lupin Diagnostics starts at ₹1,200, and home sample collection is available across cities. The table below shows approximate prices across major Indian cities:
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 1200 |
| CHENNAI | 1200 |
| HYDERABAD | 1200 |
| KOLKATA | 1200 |
| NAVI MUMBAI | 1200 |
| PUNE | 1200 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
Home Collection
Lupin Diagnostics offers anti glomerular basement membrane IgG antibody test home collection across multiple cities, making it convenient to get tested without visiting a centre. All samples are processed in NABL-accredited laboratories by trained professionals. Your digital report is shared securely via email or WhatsApp.
How to Book
Follow these steps for anti glomerular basement membrane IgG antibody test online booking process:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
The anti glomerular basement membrane IgG antibody test is used to detect antibodies that attack the kidneys and lungs. It helps doctors diagnose conditions such as Goodpasture syndrome and rapidly progressive glomerulonephritis. It is also used to check whether treatment is working in patients already diagnosed with anti-GBM disease.
No fasting is required before the anti glomerular basement membrane IgG antibody test. You can eat and drink normally on the day of collection. If your doctor has ordered additional tests at the same time, check with them whether any of those require fasting.
A positive result means antibodies against the glomerular basement membrane were detected in your blood. This is consistent with anti-GBM disease in patients who also have relevant symptoms. A positive result alone is not a diagnosis; your doctor will assess it alongside your clinical history and other findings.
Yes, false results are possible in some situations. A negative result may occur in patients who have already started treatment with immunosuppressants or plasmapheresis, even if disease is present. False-positive results have been seen in some patients with HIV-related kidney disease. Your doctor will interpret your result in the full context of your health.
The condition tends to affect two age groups: young adults aged 20 to 30 and older adults in their 60s and 70s. Men are affected slightly more often than women. Cigarette smokers and individuals with regular exposure to hydrocarbons or organic solvents face a higher risk of developing anti-GBM disease.
Not entirely. A negative result reduces the likelihood of anti-GBM disease, but it does not exclude it completely, particularly if you have already started immunosuppressant treatment or undergone plasmapheresis before the test. Your doctor will consider this when reviewing your results.
Anti Glomerular Basement Membrane IgG Antibody (Anti GBM) Test
