Description

A myasthenia gravis blood test panel checks for antibodies that attack the neuromuscular junction, which prevents muscles from contracting. The test helps diagnose myasthenia gravis (MG), a chronic autoimmune disease that causes muscle weakness. 

What the test does

  • The test looks for antibodies that attack the acetylcholine (Ach) receptor or muscle-specific tyrosine kinase (MuSK) antibodies 
  • A positive test result usually means you have MG 
  • Some patients may test negative for both antibodies, which is called seronegative MG 

Why the test is important

  • The test can help distinguish MG from other conditions that cause muscle weakness 
  • The test can help reduce unnecessary CT scans, thymectomy, and immunotherapy

Individuals should consider ordering a Myasthenia Gravis Blood Test Panel if they experience any of the following symptoms:

  • Muscle weakness in the eyes, face, throat, or limbs
  • Double vision
  • Difficulty swallowing, chewing, or speaking
  • Drooping eyelids
  • Fatigue
  • Shortness of breath
  • Hoarseness

Fasting not required.