Testing negative for autoantibodies doesn't automatically rule out MG — and you're definitely not alone in this situation. This is actually known as seronegative myasthenia gravis, and it's more common than many people realize.
Here's what's important to know:
- The two main antibody tests look for AChR and MuSK Show Full Answer
Testing negative for autoantibodies doesn't automatically rule out MG — and you're definitely not alone in this situation. This is actually known as seronegative myasthenia gravis, and it's more common than many people realize.
Here's what's important to know:
- The two main antibody tests look for AChR and MuSK antibodies
- Between 6–10% of people with MG test negative for both
- A diagnosis can still be made based on symptoms, nerve conduction studies, and response to medication like Mestinon (pyridostigmine) An MGteam member shared their own experience: "None of my bloodwork was positive, but I was diagnosed on the basis of symptoms, nerve conduction studies, and response to pyridostigmine (Mestinon)."
If standard tests come back negative, a neurologist may also recommend:
- Testing for LRP4 antibodies
- Anti-striated muscle antibody testing
- A newer, more sensitive method called a cell-based assay, which has identified AChR antibodies in people previously thought to be seronegative The good news is that treatment options for seronegative MG are generally similar to those for antibody-positive MG. A neurologist will tailor a plan based on specific symptoms and needs.
Pushing for answers and advocating for thorough testing is really important — early treatment leads to better outcomes.
May 28
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