Lab test
Myasthenia Gravis (MG) Lab Test - AChR Antibody Testing
An acetylcholine receptor binding antibody test checks the blood for autoantibodies that target the acetylcholine receptor, a protein involved in nerve-to-muscle signaling.
- Typical price
- From $319
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
An acetylcholine receptor binding antibody test checks the blood for autoantibodies that target the acetylcholine receptor, a protein involved in nerve-to-muscle signaling. It is used as a laboratory aid in the evaluation of myasthenia gravis, a condition that causes muscle weakness. The test is ordered when a healthcare provider suspects myasthenia gravis or wants to support an existing evaluation. It is one piece of a broader assessment and is not a stand-alone diagnosis. Results are interpreted alongside symptoms, physical examination, and other testing.
What this test measures
- Acetylcholine receptor (AChR) binding antibody An autoantibody directed against the acetylcholine receptor; used to help evaluate myasthenia gravis.
Who this test may be right for
- People with muscle weakness that worsens with activity
- Individuals with drooping eyelids, double vision, or difficulty swallowing or speaking
- People whose healthcare provider suspects myasthenia gravis
- Those being evaluated for a neuromuscular junction disorder
- Individuals whose healthcare provider wants to support an existing myasthenia gravis assessment
Before your visit
- No fasting is required for this blood test
- A standard blood draw is used to collect the sample
- Tell the lab about any medications you take
- Follow any specific instructions supplied with your test order
Understanding your results
A positive AChR binding antibody result can support the evaluation of myasthenia gravis, while a negative result does not rule it out, because some people with the condition do not have this antibody detected. The result is interpreted with symptoms and other testing. A positive or negative result alone is not a diagnosis. Discuss your AChR binding antibody result with a healthcare provider, who can explain what it means in the context of your overall evaluation.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What does the AChR binding antibody test detect?
It detects autoantibodies that target the acetylcholine receptor, a protein involved in signaling between nerves and muscles, and is used to help evaluate myasthenia gravis.
Does a negative AChR binding antibody result rule out myasthenia gravis?
No. Some people with myasthenia gravis do not have detectable AChR binding antibodies, so a negative result does not rule out the condition and other testing may still be needed.
Is fasting required for AChR antibody testing?
No. The acetylcholine receptor binding antibody test is a blood draw and does not require fasting.
What does the Myasthenia Gravis (MG) Lab Test - AChR Antibody Testing measure?
An acetylcholine receptor (AChR) antibody test is used to help diagnose Myasthenia Gravis (MG).
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Myasthenia Gravis (MG) Lab Test - AChR Antibody Testing results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
LabBookings is an independent directory. We compare test details and pricing information, but we are not a laboratory and we do not perform testing or provide medical advice. Always talk to a licensed healthcare provider about your results and treatment.
Laboratory services are provided by independent, CLIA-certified testing partners. Availability, pricing, and turnaround times can vary by location and are confirmed at checkout.