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Acetylcholine Receptor (AChR) Blocking Antibody Test

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Acetylcholine Receptor (AChR) Blocking Antibody Test

Short Name: AChR Blocking Ab

Also known as: AChR Blocking Antibody Test, Acetylcholine Receptor Blocking Antibody, AChR Block Ab Test, Myasthenia Gravis Antibody Test, Neuromuscular Junction Antibody Test

Acetylcholine Receptor (AChR) Blocking Antibody Test test available at DNA Labs India for ₹20,000. Uses Radioimmunoassay (RIA) on Serum samples. Results in 2-3 weeks. Free home collection in 300+ cities across India.

Specialized Immunological Blood TestUnisexAll Age Groups🏠 Home Collection

✍️ Written By

Overview

The primary purpose of the AChR Blocking Antibody test is to detect and quantify autoantibodies that block acetylcholine receptors at the neuromuscular junction. This test is specifically ordered to confirm a diagnosis of Myasthenia Gravis (MG), an autoimmune neuromuscular disorder characterized by fluctuating muscle weakness. It helps differentiate MG from other conditions presenting with similar symptoms such as Lambert-Eaton Myasthenic Syndrome or other neuromuscular disorders. The test is also used to monitor disease activity, evaluate the effectiveness of immunosuppressive treatments, and guide clinical decision-making regarding therapy adjustments. Approximately 85% of patients with generalized Myasthenia Gravis will have detectable AChR antibodies, making this an essential diagnostic tool in the immunological and neurological workup.

Test Code
50
CPT Code
86040
ICD Code
G70.00
Price
₹20,000
Sample Type
Serum
Result Time
2-3 weeks
Fasting Required
No
Method
Radioimmunoassay (RIA)
Step 1

Sample Collection

Duly filled Test Send Out Consent Form (Form 35) is mandatory. Inform your physician about any immunosuppressive medications or recent plasma exchange procedures. No fasting is required. Stay well-hydrated before the blood draw.

Method: Venipuncture

Step 2

Laboratory Analysis

A trained phlebotomist will collect approximately 2 mL of blood from a vein in your arm using a Red Top (No Additive) tube. The procedure typically takes less than 5 minutes. Mild discomfort or slight bruising at the puncture site may occur.

Step 3

Report Delivery

Apply gentle pressure with cotton or a bandage at the collection site for 3-5 minutes. Avoid heavy lifting with the collection arm for a few hours. The sample will be shipped refrigerated or frozen to the reference laboratory for analysis using Radioimmunoassay.

Timeline: 2-3 weeks

Patient Instructions

1
Before the Test:No special preparation or fasting is required. Ensure the Test Send Out Consent Form (Form 35) is duly filled and signed. Inform your healthcare provider about all current medications, particularly immunosuppressants or corticosteroids, as they may affect antibody levels.
2
During the Test:A healthcare professional will draw approximately 2 mL of blood from a vein in your arm. The blood is collected in a Red Top (No Additive) tube and the process typically takes under 5 minutes. You may feel a brief prick during needle insertion.
3
After the Test:After blood collection, pressure will be applied to the puncture site. You may resume normal activities immediately. The serum will be separated and shipped refrigerated or frozen to the reference laboratory for radioimmunoassay analysis. Results will be available in 2-3 weeks.

About This Test

Who Should Get This Test

The primary purpose of the AChR Blocking Antibody test is to detect and quantify autoantibodies that block acetylcholine receptors at the neuromuscular junction. This test is specifically ordered to confirm a diagnosis of Myasthenia Gravis (MG), an autoimmune neuromuscular disorder characterized by fluctuating muscle weakness. It helps differentiate MG from other conditions presenting with similar symptoms such as Lambert-Eaton Myasthenic Syndrome or other neuromuscular disorders. The test is also used to monitor disease activity, evaluate the effectiveness of immunosuppressive treatments, and guide clinical decision-making regarding therapy adjustments. Approximately 85% of patients with generalized Myasthenia Gravis will have detectable AChR antibodies, making this an essential diagnostic tool in the immunological and neurological workup.

How to Prepare

  • Duly filled Test Send Out Consent Form (Form 35) is mandatory
  • Use 1 Red Top (No Additive) tube only
  • Do not use SST gel barrier tubes
  • Ship sample refrigerated or frozen
  • Minimum serum volume required: 0.5 mL
  • Avoid hemolysis during blood collection

Doctor's Notes

"The AChR Blocking Antibody test is a highly specific investigation for Myasthenia Gravis. While it focuses on antibodies that block the acetylcholine receptor, it is often ordered alongside AChR binding and modulating antibody tests for a comprehensive autoimmune evaluation. A positive result strongly supports the diagnosis of Myasthenia Gravis and helps guide treatment strategies including immunosuppressive therapy. Early detection through this test can significantly improve patient outcomes."

Test Parameters & Specifications

Sample TypeSerum
Sample Volume2 mL (0.5 mL minimum)
Container1 Red Top (No Additive) tube. Do not use SST gel barrier tubes.
Collection MethodVenipuncture

Sample Stability

Room TemperatureUp to 8 hours
Refrigerated (2-8°C)Up to 14 days
Frozen (-20°C or below)Up to 30 days
Sample Rejection Criteria:
  • Sample collected in SST gel barrier tubes
  • Hemolysed or lipemic samples
  • Missing or incomplete Test Send Out Consent Form (Form 35)
  • Insufficient sample volume (less than 0.5 mL serum)
  • Sample stored at room temperature beyond 8 hours

Understanding Your Results

Interpretation of the AChR Blocking Antibody test results should be performed by a qualified immunologist or neurologist in conjunction with clinical findings, additional laboratory tests, and the patient's overall medical history. A positive result supports a diagnosis of Myasthenia Gravis, while a negative result does not entirely exclude the condition.
📊

Negative: No detectable AChR blocking antibodies. Does not completely rule out Myasthenia Gravis.

Status: Normal

📊

Borderline/Weak positive: May require repeat testing and correlation with clinical symptoms.

Status: Borderline

📊

Positive: Strongly suggestive of Myasthenia Gravis. Clinical correlation and additional diagnostic tests recommended.

Status: Abnormal

⚠️ When to Consult a Doctor:

Consult your physician or neurologist immediately if you experience progressive muscle weakness, difficulty breathing, sudden worsening of ptosis, or inability to swallow. If your AChR Blocking Antibody test returns positive, timely consultation is essential for initiating appropriate treatment. Even with negative results, persistent symptoms warrant further clinical evaluation.

Limitations

  • ⚠A negative result does not completely rule out Myasthenia Gravis as approximately 15% of generalized MG patients are seronegative
  • ⚠This test measures blocking antibodies only; binding and modulating antibodies require separate assays
  • ⚠Results may take 2-3 weeks due to the specialized nature of the radioimmunoassay
  • ⚠Cannot distinguish between different subtypes of Myasthenia Gravis on its own

Risks & Considerations

  • ●Minor bruising or swelling at the blood collection site
  • ●Slight pain during venipuncture
  • ●Rare risk of infection at the puncture site
  • ●Very rare risk of fainting during blood draw

Interfering Factors

  • ●Use of SST gel barrier tubes may interfere with test accuracy
  • ●Recent immunosuppressive therapy or plasmapheresis may reduce antibody levels
  • ●Sample hemolysis or improper storage may affect results
  • ●Timing of immunotherapy administration may influence antibody titres

Compare With Similar Tests

TestAcetylcholine Receptor (AChR) Blocking Antibody TestAChR Binding AntibodyAChR Modulating AntibodyAnti-MuSK Antibody
ComparisonAcetylcholine Receptor (AChR) Blocking Antibody Test

Frequently Asked Questions

What is the AChR Blocking Antibody test used for?
The AChR Blocking Antibody test is used to detect autoantibodies that block acetylcholine receptors at the neuromuscular junction. It is primarily ordered to support the diagnosis of Myasthenia Gravis (MG), an autoimmune condition causing muscle weakness. A positive result strongly suggests MG and helps guide treatment decisions.
How is the AChR Blocking Antibody test different from the AChR Binding Antibody test?
The AChR Binding Antibody test detects all antibodies that bind to acetylcholine receptors, while the AChR Blocking Antibody test specifically identifies only those antibodies that block the receptor's ability to bind acetylcholine. Both tests are complementary and are often ordered together for a comprehensive MG evaluation.
Do I need to fast before the AChR Blocking Antibody test?
No, fasting is not required for the AChR Blocking Antibody test. You can eat and drink normally before the blood draw. However, you must ensure that the Test Send Out Consent Form (Form 35) is duly filled and signed prior to sample collection.
What does a positive AChR Blocking Antibody test result mean?
A positive result indicates the presence of autoantibodies that block acetylcholine receptors, which is strongly suggestive of Myasthenia Gravis. Your physician will correlate this result with your clinical symptoms and may recommend additional tests such as AChR binding and modulating antibody tests or electromyography for a complete diagnosis.
Can the AChR Blocking Antibody test be normal if I have Myasthenia Gravis?
Yes. Approximately 15% of patients with generalized Myasthenia Gravis are seronegative for AChR antibodies. A negative result does not completely rule out MG. Your physician may order additional tests such as Anti-MuSK antibody testing, repetitive nerve stimulation, or single-fiber electromyography for further evaluation.
How long does it take to get the AChR Blocking Antibody test results?
The AChR Blocking Antibody test is a specialized assay that uses Radioimmunoassay technology. Results are typically available within 2 to 3 weeks from the date of sample collection. You will receive your report through the online portal, email, or WhatsApp.
What is the cost of the AChR Blocking Antibody test at DNA Labs India?
The AChR Blocking Antibody test at DNA Labs India costs INR 20,000. This price includes blood sample collection, laboratory analysis, and digital report delivery. Free home sample collection is available for online bookings across India.
Is the AChR Blocking Antibody test covered by insurance in India?
Coverage for the AChR Blocking Antibody test varies depending on your insurance provider and policy terms. Government schemes such as PMJAY, CGHS, ECHS, and ESIC may have specific provisions for specialized antibody tests. We recommend checking directly with your insurance provider for coverage details.
What sample is required for the AChR Blocking Antibody test?
The test requires 2 mL (minimum 0.5 mL) of serum collected in a Red Top (No Additive) tube. SST gel barrier tubes must not be used as they may interfere with the assay. The sample must be shipped refrigerated or frozen to the reference laboratory.
Can medications affect the AChR Blocking Antibody test results?
Yes, certain medications can affect test results. Immunosuppressive drugs, corticosteroids, and recent plasmapheresis or intravenous immunoglobulin therapy may lower antibody levels, potentially leading to false-negative results. Always inform your physician about all current medications before testing.
Is home sample collection available for the AChR Blocking Antibody test?
Yes, DNA Labs India offers free home sample collection for the AChR Blocking Antibody test when booked online. This service is available across numerous cities in India including Mumbai, Delhi, Bangalore, Hyderabad, Chennai, Kolkata, Pune, and many more. The sample will be collected by a trained phlebotomist at your convenience.
What other tests may be ordered alongside the AChR Blocking Antibody test?
Alongside the AChR Blocking Antibody test, your physician may order the AChR Binding Antibody test, AChR Modulating Antibody test, Anti-MuSK Antibody test, repetitive nerve stimulation (RNS) studies, single-fiber electromyography (SFEMG), or a CT scan of the chest to evaluate the thymus gland for thymoma.
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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