Acetylcholine Receptor Antibody Test: Booking, Price, and Results
About Acetylcholine Receptor Antibody Test
| Field | Value |
|---|---|
| Also Known As | AChR antibody, Anti-AChR, Myasthenia gravis antibody, Acetylcholine receptor binding antibody, Acetylcholine receptor blocking antibody, Acetylcholine receptor modulating antibody |
| Sample Type | Serum (venous blood) |
| Fasting Required | No fasting required |
| Report Time | 1 Day |
| Recommended For | All ages and genders; most common in women under 40 and men over 60 |
| Price | Starting at ₹2,800 |
What is an Acetylcholine Receptor Antibody Test?
The acetylcholine receptor antibody test detects specific proteins in the blood called autoantibodies, which the immune system mistakenly produces against acetylcholine receptors on muscle fibres. These receptors play a key role in muscle contraction. Doctors most commonly order this test when a patient shows signs of unexplained muscle weakness. It is also known as the AChR antibody test or Myasthenia gravis antibody test, and a serum blood sample is used for analysis.
What Does an Acetylcholine Receptor Antibody Test Measure?
This test identifies and measures three distinct types of autoantibodies, each affecting muscle function in a different way. The table below summarises what each type does.
| Antibody Type | What it Does |
|---|---|
| Binding Antibody | Activates the complement immune system, leading to loss of acetylcholine receptors on muscle cells |
| Blocking Antibody | Prevents acetylcholine (a chemical messenger) from attaching to its receptor, resulting in poor muscle contraction |
| Modulating Antibody | Causes receptors to be pulled inside the cell and lost from the muscle surface; most closely linked to disease severity |
Why is an Acetylcholine Receptor Antibody Test Done?
Doctors request the acetylcholine receptor antibody test when a patient reports muscle weakness that worsens with activity, or that cannot be explained by other causes. The test helps confirm or rule out specific neuromuscular conditions.
Common Symptoms That May Require This Test
Several symptoms can prompt a doctor to order this test. The following are listed from most to least commonly associated with the conditions this test detects.
- Droopy eyelids affecting one or both eyes
- Double vision
- Difficulty chewing or swallowing
- Slurred or unclear speech
- Trouble making normal facial expressions
- Difficulty walking or climbing stairs
- General muscle fatigue that worsens with repeated use
Conditions This Test Can Help Detect
The AChR antibody test can help identify a range of conditions. These include:
- Myasthenia gravis (MG), the primary condition this test is designed to diagnose
- Thymoma (a tumour of the thymus gland), with or without myasthenia gravis
- Lambert-Eaton myasthenic syndrome, a condition involving impaired acetylcholine release from nerve endings
- Paraneoplastic neurological disorders (conditions affecting the nervous system linked to underlying cancers)
Acetylcholine Receptor Antibody Test for Chronic Disease Monitoring
For patients already diagnosed with myasthenia gravis, repeat testing can be a valuable tool. Changes in antibody levels over time may indicate how well a treatment is working or signal a risk of relapse. Serial measurements at three and six months after starting therapy are recommended to assess response in antibody-positive patients.
How to Prepare and What to Expect
No special preparation is needed for the acetylcholine receptor antibody test procedure, but a few simple steps will help ensure an accurate result.
Do You Need to Fast?
No, fasting is not required before this test. You can eat and drink normally on the day of sample collection.
Practical Tips Before Your Test
- Bring a detailed clinical history, including your symptoms, previous test results, and family medical history, as this is required for the test
- Avoid muscle relaxants and anaesthetics for at least 24 hours before sample collection
- Inform your doctor about all current medications, including immunosuppressants and supplements, as these can affect results
- Be aware that recent anaesthesia or muscle relaxants used for surgery within 48 hours of the test may produce a false-positive result
- The test can be done at any time of day; no specific timing is needed
Step-by-Step Procedure
The sample collection process is straightforward and takes only a few minutes. Here is what to expect.
- A trained phlebotomist cleans a small area on your arm with an antiseptic.
- A needle is gently inserted into a vein, usually at the inside of the elbow, to draw a blood sample.
- Around 3 ml of blood is collected into a yellow-top serum separator tube.
- The needle is removed, and a small bandage is applied to the site.
- The sample is separated from blood cells as soon as possible, ideally within two hours of collection.
- The processed serum is refrigerated and dispatched to the laboratory for analysis using the EIA (enzyme immunoassay) method.
Factors That Can Affect Accuracy
Certain factors may influence your test results. These include:
- Use of muscle relaxants or anaesthetics within 48 hours before the test
- Immunosuppressant therapy, which may lower antibody levels
- Medications such as penicillamine, which can cause symptoms similar to myasthenia gravis
- Elevated immunoglobulin levels due to other disorders or treatments, which may lead to false-positive readings
Understanding Your Acetylcholine Receptor Antibody Test Results
Your results reflect the level of AChR antibody detected in your blood. The table below shows the reference ranges for each antibody type.
| Parameter | Normal Range | Unit |
|---|---|---|
| AChR Binding Antibody | 0.05 or below (negative) | nmol/L |
| AChR Blocking Antibody | Less than 15% blocking | % |
| AChR Modulating Antibody | Less than 20% modulation | % |
In a healthy individual, no AChR antibodies are normally present in the bloodstream. A result above the reference range, in the presence of matching symptoms, is strongly associated with myasthenia gravis.
A negative result, however, does not fully exclude myasthenia gravis. Approximately one in five people with the condition do not have detectable antibodies in their blood. Nearly half of those with ocular myasthenia gravis (affecting only the eye muscles) may also test negative.
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
- Elevated AChR antibody levels have been reported in autoimmune conditions such as primary biliary cirrhosis and Graves' ophthalmopathy, even without myasthenia gravis.
- Some patients with Guillain-Barré syndrome may show temporarily raised levels.
- Small-cell lung cancer is associated with significant antibody levels in around 15% of patients.
- Immunosuppressive therapy may reduce antibody levels, which can make results harder to interpret.
How to Maintain Healthy Levels
While antibody levels are primarily managed through medical treatment, these general steps may support overall well-being.
- Follow your prescribed treatment plan consistently, as antibody levels tend to decrease with effective therapy.
- Schedule regular follow-up appointments with a neurologist to track disease progression.
- Rest adequately and avoid overexertion, which may help manage muscular symptoms day to day.
Lupin Diagnostics Acetylcholine Receptor Antibody Test Price and Home Collection
The acetylcholine receptor antibody test cost at Lupin Diagnostics starts at ₹2,800, and home sample collection is available across cities in India. The approximate city-wise prices are listed below.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 2000 |
| CHENNAI | 2000 |
| HYDERABAD | 2000 |
| KOLKATA | 2800 |
| NAVI MUMBAI | 2800 |
| PUNE | 2000 |
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.
- 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
Acetylcholine receptor antibody test home collection is available across multiple cities in India. A trained phlebotomist visits your home, collects the blood sample, and dispatches it to a NABL-accredited Lupin Diagnostics laboratory. Your digital report is delivered securely via email or WhatsApp.
Frequently Asked Questions
The acetylcholine receptor antibody test is primarily used to diagnose myasthenia gravis, a condition that causes muscle weakness worsened by activity. It also helps distinguish myasthenia gravis from other conditions with similar symptoms and can be used to monitor treatment response in diagnosed patients.
No, fasting is not required. You can eat and drink normally before your appointment. However, you should avoid muscle relaxants and anaesthetics for at least 24 hours before sample collection to ensure an accurate result.
No, a negative result does not rule out myasthenia gravis. Around one in five people with the condition do not have detectable AChR antibody in their blood. If symptoms are present and the result is negative, your doctor may order additional tests such as anti-MuSK antibody testing or electromyography.
The test measures binding antibodies (which activate the complement system and cause receptor loss), blocking antibodies (which prevent acetylcholine from attaching to its receptor), and modulating antibodies (which cause receptors to be drawn inside the cell and lost from the muscle surface).
Yes. AChR antibody may also be detected in thymoma, Lambert-Eaton myasthenic syndrome, autoimmune liver disease, primary biliary cirrhosis, Graves' ophthalmopathy, and in some cases of small-cell lung cancer or Guillain-Barré syndrome. Your doctor will consider these possibilities alongside your clinical history.
A certified phlebotomist visits your home and collects a small blood sample from a vein in your arm. The sample is placed in a serum separator tube, processed within two hours of collection, and sent to the laboratory under refrigerated conditions. There is no difference in the procedure compared to a centre visit.
For patients on treatment for myasthenia gravis, repeat testing is typically recommended at three and six months after starting therapy. The frequency of monitoring after that depends on individual disease progress and your neurologist's guidance.
Acetylcholine Receptor Antibody Test: Booking, Price, and Results
