Autoimmune Encephalitis Panel Test
About Autoimmune Encephalitis Panel Test
| Field | Value |
|---|---|
| Also Known As | AE Panel, Autoimmune Encephalopathy Panel, Neural Antibody Panel, Anti-neuronal Antibody Panel |
| Sample Type | Serum (venous blood); CSF (cerebrospinal fluid) may also be tested for greater sensitivity |
| Fasting Required | No fasting required |
| Report Time | 5 to 14 days, depending on panel complexity |
| Recommended For | All genders and ages; paediatric-specific panels available for patients under 18 years |
| Price | Starting at ₹17,000 |
What Is an Autoimmune Encephalitis Panel Test?
The Autoimmune Encephalitis Panel test is a specialised blood test that detects specific antibodies that may be attacking the brain. These antibodies are produced by the immune system but can mistakenly target healthy nerve cells, causing a condition known as autoimmune encephalitis. Doctors order this test when a patient presents with unexplained psychiatric or neurological symptoms. A blood (serum) sample is tested most commonly, though cerebrospinal fluid (CSF) from a spinal tap may also be used for greater accuracy.
What Does an Autoimmune Encephalitis Panel Test Measure?
This panel screens for several distinct antibodies, each linked to a different brain receptor. A positive result for any of these antibodies helps doctors narrow down the type of autoimmune condition affecting the patient.
The following antibodies are included in the panel:
| Antibody | Target | Clinical Association |
|---|---|---|
| NMDA Receptor Antibody | N-methyl-D-aspartate receptor | NMDA receptor encephalitis; neurological disorders |
| AMPA Receptor Antibody (GluR1 and GluR2) | AMPA-type glutamate receptors | Autoimmune neurological syndromes; paraneoplastic syndromes |
| GABA-B Receptor Antibody | Gamma-aminobutyric acid B receptor | Autoimmune neurological syndromes |
| LGI1 Antibody | Leucine-rich glioma-inactivated 1 protein | Limbic encephalitis (inflammation of the brain's memory centre) |
| CASPR2 Antibody | Contactin-associated protein-like 2 | Autoimmune encephalitis syndromes |
| GAD65 Antibody | Glutamic acid decarboxylase enzyme | Stiff-person syndrome; autoimmune neurological disorders |
| DPPX Antibody | Dipeptidyl-peptidase-like protein-6 | Autoimmune encephalitis |
Why Is an Autoimmune Encephalitis Panel Test Done?
A doctor may request the Autoimmune Encephalitis Panel when a patient develops neurological or psychiatric symptoms that do not have a clear cause. This test helps confirm or rule out an immune-mediated cause for the symptoms.
Common Symptoms That May Require This Test
Several symptoms may prompt a doctor to order this test. Here are the most common ones:
- Sudden confusion or altered mental state
- Memory loss, particularly short-term memory problems
- New-onset seizures without a prior history of epilepsy
- Hallucinations or unexplained psychosis
- Involuntary movements such as tremors or rigidity
- Significant difficulty with concentration or cognition
- Delirium or fluctuating levels of consciousness
Conditions This Test Can Help Detect
The panel can provide evidence for several neurological conditions. These include:
- Autoimmune encephalitis (a broad group of conditions where the immune system attacks the brain)
- Anti-NMDAR encephalitis, which often progresses to reduced consciousness and abnormal movements
- LGI1 encephalitis, a form of limbic encephalitis more common in older men
- Paraneoplastic neurological syndromes, where encephalitis is linked to an underlying tumour
- Stiff-person syndrome, associated with elevated GAD65 antibodies
How to Prepare and What to Expect
Preparing for the Autoimmune Encephalitis Panel test is straightforward. There are a few steps that can help ensure accurate results.
Do You Need to Fast?
No, fasting is not required before this test. You may eat and drink normally on the day of collection.
However, for the most reliable results, the sample should ideally be collected before starting immunosuppressant medications or intravenous immunoglobulin (IVIg) therapy. Once treatment begins, antibody levels in the blood may fall, which can reduce the test's sensitivity.
Practical Tips Before Your Test
A few simple steps can help improve the quality of your sample and the accuracy of your results:
- Tell your doctor about all your current medications, especially any immunosuppressants.
- Mention any recent infections or vaccinations.
- If both serum and CSF testing are recommended, follow your doctor's guidance on the spinal tap procedure.
- Inform your doctor if you have recently received any radioactive treatment or imaging agents, as these can interfere with certain assays.
- Wear a loose, short-sleeved top for easy access to the arm during blood collection.
Step-by-Step Procedure
Here is what to expect during sample collection:
- A trained phlebotomist will ask you to sit comfortably and expose your inner arm.
- An antiseptic swab is used to clean the venepuncture site, usually the inner elbow.
- A tourniquet is placed around the upper arm to make the vein more visible.
- A needle is gently inserted, and the blood is drawn into a collection tube.
- The needle is removed, and a small cotton swab or bandage is applied to the site.
- Your labelled sample is securely packaged and dispatched to the laboratory for processing.
Factors That Can Affect Accuracy
Certain factors may influence your results. These include:
- Collecting the sample after starting immunotherapy, which can lower antibody levels
- Testing only serum without CSF, which reduces sensitivity for some antibodies
- Poor handling or delayed transport of the sample
- Recent exposure to radioactive isotopes used in treatment or diagnostic imaging
Understanding Your Autoimmune Encephalitis Panel Test Results
Results from this panel require careful interpretation by a qualified neurologist or physician. A negative result means none of the antibodies was detected, suggesting these specific immune targets are not the cause of your symptoms. A positive result indicates the presence of one or more antibodies and requires correlation with your clinical presentation, imaging studies, and medical history.
The table below shows the expected normal range for each parameter:
| Parameter | Normal Result | What a Positive May Suggest |
|---|---|---|
| NMDA Receptor Antibody | Negative (not detected) | Risk of neurological disorder; requires clinical correlation |
| AMPA Receptor Antibody (GluR1/GluR2) | Negative (not detected) | Autoimmune syndrome or paraneoplastic condition |
| GABA-B Receptor Antibody | Negative (not detected) | Autoimmune neurological syndrome |
| LGI1 Antibody | Negative (not detected) | Likely limbic encephalitis |
| CASPR2 Antibody | Negative (not detected) | Autoimmune encephalitis syndrome |
| GAD65 Antibody | Negative or low titre | Very high titre more predictive of disease |
| DPPX Antibody | Negative (not detected) | Possible autoimmune encephalitis |
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 patient profiles and clinical contexts can affect how results are interpreted.
- Anti-NMDAR encephalitis predominantly affects women (around 81% of cases) and younger patients. Women over 18 years with a positive anti-NMDAR result may be investigated for an ovarian teratoma, as a significant proportion of these patients carry one.
- For LGI1 encephalitis, CSF changes are less common (seen in around 36% of cases) compared with NMDAR encephalitis (where CSF is abnormal in around 94% of cases).
- For GAD65 antibodies, a very high titre is considered more meaningful than a mildly elevated one. Prior immunotherapy can reduce antibody detectability, potentially leading to a false-negative result.
How to Maintain Healthy Levels
While this test is used to detect an immune-mediated condition rather than routine health markers, the following general steps support brain and immune health:
- Seek prompt medical attention for any sudden onset of psychiatric, memory-related, or neurological symptoms.
- Maintain regular follow-up appointments if you have a known history of autoimmune conditions.
- Women with a history of ovarian teratoma should discuss neurological monitoring with their doctor.
Lupin Diagnostics Autoimmune Encephalitis Panel Test Price and Home Collection
The Autoimmune Encephalitis Panel test is available at Lupin Diagnostics, with prices starting at ₹17,000. Home sample collection is available, making it easier to get tested without visiting a centre.
Price by City
| Lab or City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹20,000 |
| Pune | ₹20,000 |
| Chennai | ₹17,000 |
| Bengaluru | ₹17,000 |
| Hyderabad | ₹17,000 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot via the online booking page.
- 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.
Home Collection
Lupin Diagnostics offers home blood sample collection across cities, so you can book the Autoimmune Encephalitis Panel test near you without the need to travel. All samples are processed in NABL-accredited laboratories by trained technologists. Digital reports are sent directly via email or WhatsApp once ready.
Please note that CSF collection requires a lumbar puncture performed by a doctor in a clinical setting and cannot be done at home.
Frequently Asked Questions
The Autoimmune Encephalitis Panel test detects antibodies that the immune system may be directing against the brain. It is a specialised diagnostic tool used when a patient has unexplained neurological or psychiatric symptoms. Identifying the specific antibody involved helps doctors determine the type of autoimmune encephalitis and guide further investigation.
This test is appropriate for individuals who develop a subacute onset of unexplained symptoms such as changes in behaviour, memory problems, seizures, or altered consciousness. It is ordered by a neurologist or physician when an autoimmune or inflammatory cause is suspected. It is not a routine screening test for the general population.
No fasting is required. You can eat and drink as usual before the test. However, for the most accurate results, the sample should be collected before starting immunosuppressant therapy or IVIg treatment if possible.
Testing both blood (serum) and cerebrospinal fluid (CSF) improves the overall accuracy of the Autoimmune Encephalitis Panel. Some antibodies, such as anti-NMDAR, are detected more reliably in CSF than in serum alone. Any positive serum result is ideally confirmed in CSF to reduce the chance of a misleading result.
Yes, it can. Around half of all autoimmune encephalitis cases do not show detectable antibodies on current tests. This can happen because the specific antibody causing the condition may not yet be covered by standard panels, or because inflammation in the brain is not antibody-mediated. Diagnosis is always based on the full clinical picture, not the antibody result alone.
In some cases, yes. Certain antibodies detected by this panel are associated with underlying tumours. For example, a positive anti-NMDAR result in women may prompt investigation for ovarian teratoma. Positive results for other antibodies may raise suspicion for conditions such as small-cell lung cancer or thymoma. Your doctor will advise on any further investigations needed.
Autoimmune Encephalitis Panel Test
