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Acetylcholine Receptor Antibody Test: Costs, Purpose, Normal Range and Interpretation

Acetylcholine Receptor Antibody Test (ACHR Antibody)

  • Sample Type : Blood
  • Parameters : 1
  • Report Time : 24/48 Hrs
  • Home Collection: Yes
  • Fasting : Not Required
  • Age Group: All
OFFER PRICE:  ₹1880 ₹2400 30% off

 

AChR Antibody Test
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Acetylcholine receptor antibodies (AChR antibodies) are autoantibodies produced by the immune system that target the acetylcholine receptors (AChR) located on the surface of muscle cells. These antibodies play a significant role in the development of certain autoimmune diseases, specifically myasthenia gravis (MG). The function of AChR antibodies is primarily associated with the pathogenesis of myasthenia gravis, a chronic autoimmune neuromuscular disorder. In MG, the immune system mistakenly recognizes the AChR as foreign and produces antibodies against it. These antibodies bind to the AChR receptors, interfering with their normal function and impairing neuromuscular transmission.

The Acetylcholine Receptor Antibody (AChR Antibody) test is primarily used to assist in the diagnosis of myasthenia gravis (MG), a chronic autoimmune neuromuscular disorder. However, there are other conditions in which the AChR Antibody test may be ordered to aid in diagnosis. These conditions include:

  • Lambert-Eaton myasthenic syndrome (LEMS): LEMS is another neuromuscular disorder that can cause muscle weakness and fatigue. It is caused by an autoimmune response that targets the voltage-gated calcium channels in nerve endings. While LEMS is not directly associated with AChR antibodies, approximately 50% of LEMS patients also have detectable levels of AChR antibodies, making the AChR Antibody test useful in certain cases.
  • Congenital myasthenic syndromes (CMS): CMS are a group of inherited neuromuscular disorders characterized by impaired neuromuscular transmission. Some forms of CMS are associated with mutations in genes that affect the structure and function of the acetylcholine receptors. In specific cases of CMS suspected to be related to AChR dysfunction, the AChR Antibody test may be ordered to help differentiate it from other forms of CMS.
  • Suspected thymoma: Thymomas are tumors of the thymus gland, which is involved in the development of immune cells. Thymomas can be associated with the development of autoimmune disorders, including myasthenia gravis. Testing for AChR antibodies can help support the diagnosis of thymoma-related myasthenia gravis and guide treatment decisions.

The Acetylcholine Receptor Antibody (AChR Antibody) test is performed by drawing a blood sample from a vein in your arm. Our phlebotomist, will clean the site with an antiseptic and apply a tourniquet to make the veins more visible. He will then insert a sterile needle into a vein and collect the required amount of blood into a collection tube.

Interpreting Acetylcholine Receptor Antibody (AChR Antibody) test results involves understanding the reference range, clinical context, and considering other diagnostic findings. Here's a general guide on interpreting AChR Antibody test results:

  • Positive result: A positive AChR Antibody test result indicates the presence of AChR antibodies in the blood. This finding supports the diagnosis of myasthenia gravis (MG) or suggests an association with other neuromuscular disorders such as Lambert-Eaton myasthenic syndrome (LEMS) in some cases. A positive result, along with clinical symptoms and other diagnostic tests, strengthens the likelihood of MG or LEMS as the underlying cause of muscle weakness and fatigue.
  • Negative result: A negative AChR Antibody test result suggests the absence of detectable AChR antibodies in the blood. However, it's important to note that a negative result does not completely rule out myasthenia gravis or other related neuromuscular disorders. Approximately 10-20% of MG patients, particularly those with ocular (eye) MG or with antibodies against other proteins involved in neuromuscular transmission (such as MuSK antibodies), may have negative AChR Antibody test results.
  • Borderline result: Sometimes, the AChR Antibody test may yield a borderline or equivocal result, falling between the clearly positive and negative ranges. In such cases, further evaluation and correlation with clinical symptoms and other diagnostic tests are necessary to determine the significance of the result. Additional testing or monitoring over time may be required to reach a definitive diagnosis.

High levels of Acetylcholine Receptor Antibodies (AChR Antibodies) are primarily associated with the autoimmune disorder myasthenia gravis (MG). The treatment for high AChR Antibody levels focuses on managing the symptoms and underlying immune response of MG. Here are some common treatment approaches:

    Medications:
    1. Cholinesterase inhibitors: These medications, such as pyridostigmine, help improve neuromuscular transmission by increasing the availability of acetylcholine in the synaptic cleft. They can alleviate muscle weakness and fatigue.
    2. Immunosuppressants: Medications like corticosteroids (e.g., prednisone) or other immunosuppressive drugs (e.g., azathioprine, mycophenolate mofetil, cyclosporine) may be prescribed to suppress the immune response and reduce antibody production. These medications help control the autoimmune process and manage the symptoms of MG.
    3. Thymectomy: For individuals with thymoma (a tumor of the thymus gland) or certain cases of non-thymomatous MG, surgical removal of the thymus gland (thymectomy) may be recommended. Thymectomy can help reduce the production of AChR Antibodies and improve long-term disease control.
  • Intravenous Immunoglobulin (IVIg): IVIg is a treatment option for acute exacerbations or severe symptoms of MG. It involves infusing high-dose immunoglobulins derived from healthy donors. IVIg can provide temporary immune modulation, reducing the effects of AChR Antibodies and improving muscle strength.
  • Plasmapheresis or Plasma Exchange: Plasmapheresis involves filtering the blood to remove AChR Antibodies and other circulating immune factors. Plasma exchange replaces the patient's plasma with donor plasma or a plasma substitute. Both methods aim to reduce the levels of AChR Antibodies and provide short-term improvement in muscle strength.

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FAQs around Acetylcholine Receptor Antibody (AChR Antibody) Test

The Acetylcholine Receptor Antibody (AChR Antibody) Test cost is Rs.2400, although it is now available for Rs.1880 because of the offer.

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