also known as Acetylcholine receptor Ab in Serum by Immunoassay
The Acetylcholine Receptor (AChR) Binding Antibody test is a specialized blood test used to help diagnose Myasthenia Gravis (MG), a chronic autoimmune neuromuscular disorder that causes muscle weakness and fatigue. This condition occurs when the immune system mistakenly produces antibodies that interfere with normal nerve-to-muscle communication. In healthy muscle function, acetylcholine acts as a chemical messenger that allows nerves to signal muscles to contract. In Myasthenia Gravis, AChR antibodies disrupt this process, leading to weakened muscle responses that often worsen with activity and improve with rest. This test specifically measures AChR binding antibodies, the most common and clinically significant antibodies associated with MG. These antibodies are present in approximately 85–90% of individuals diagnosed with Myasthenia Gravis, making this test the primary and most reliable screening tool for the condition. Because AChR antibodies are not normally found in the blood, their presence strongly suggests an autoimmune cause of muscle weakness. Identifying these antibodies early helps support accurate diagnosis, guide further testing, and enable timely treatment to improve muscle strength and quality of life. What Is Included In This Test? This test measures the presence and level of acetylcholine receptor binding antibodies in the blood. Your results can help: Support the diagnosis of Myasthenia Gravis Distinguish MG from other causes of muscle weakness or fatigue Confirm autoimmune disruption of nerve-to-muscle signaling Guide follow-up testing for modulating or blocking antibodies if needed Assist in treatment planning and disease monitoring A positive binding antibody result is highly specific for Myasthenia Gravis and is rarely present in individuals without the condition. Who Should Consider This Test? This test is ideal for individuals experiencing symptoms suggestive of neuromuscular dysfunction. You should consider this test if you: Have persistent muscle weakness that worsens with activity Experience drooping eyelids, double vision, or facial muscle fatigue Have difficulty chewing, swallowing, or speaking Have unexplained muscle fatigue that improves with rest Are being evaluated for suspected Myasthenia Gravis Early diagnosis allows for more effective treatment and improved long-term symptom management. Convenient, No-Appointment Testing To complete your test: Order online through our website Use the lab locator to find a nearby testing location Walk in; no appointment required Access your results securely in your HealthLabs.com account within one to three business days 110% Price Guarantee! If you find the same test for a lower price from a comparable provider, contact us. We not only match the price, we beat it by an additional 10 percent of the difference.