Achr-acetyl Choline Receptor Antibodies, Serum

What is ACHR, Acetyl choline receptor antibody test?

A blood test that detects autoantibodies against acetylcholine receptors at the neuromuscular junction; these antibodies interfere with nerve-to-muscle signaling and are strongly associated with myasthenia gravis (MG).

Why consider ACHR, Acetyl choline receptor antibody test?

• To support the diagnosis of MG in patients with compatible symptoms and to distinguish MG from other causes of fatigable weakness.
• To establish a serologic baseline and, in some cases, track antibody levels over time alongside clinical response.
• To evaluate for autoimmune risk when a thymoma is present, or when MG is suspected but clinical tests are inconclusive.

Who should get this ACHR, Acetyl choline receptor antibody test?

• Individuals with suggestive MG features: fluctuating muscle weakness that worsens with activity and improves with rest, ptosis, diplopia, dysphagia, dysarthria, neck flexor weakness, or exertional fatigue.
• Patients with generalized or ocular MG suspicion, or with imaging evidence of thymic pathology (thymic hyperplasia/thymoma).
• Seronegative patients for whom alternative antibodies (e.g., MuSK, LRP4) and electrophysiologic testing are being considered as part of a comprehensive workup.

More Information about ACHR, Acetyl choline receptor antibody test?

Autoantibodies against acetylcholine receptors (AChRs) at the neuromuscular junction are immune proteins that mistakenly target the nicotinic AChRs on the muscle endplate, disrupting nerve-to-muscle signaling and causing fatigable weakness typical of myasthenia gravis. These antibodies can:

• Bind and directly block ACh from activating the receptor, reducing ion channel opening and endplate depolarization.
• Cross-link receptors, accelerating their internalization and degradation (antigenic modulation), which lowers receptor density.
• Activate complement on the postsynaptic membrane, damaging the junctional folds and further impairing neuromuscular transmission.

OTHER NAMES: AChR Antibodies; Acetylcholine Receptor Antibody,  Binding/Blocking/Modulating , Myasthenia Gravis Antibodies, Anti-AChR (Serum)