What may cause false-positive anti-acetylcholine receptor (AChR) antibody test results in the evaluation of myasthenia gravis (MG)?

Updated: Aug 27, 2018
  • Author: Abbas A Jowkar, MBBS; Chief Editor: Nicholas Lorenzo, MD, CPE, MHCM, FAAPL  more...
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False-positive anti-AChR antibody test results have been reported in patients with the following:

  • Thymoma without MG

  • Lambert-Eaton myasthenic syndrome

  • Small cell lung cancer

  • Rheumatoid arthritis treated with penicillamine

  • 1-3% of the population older than 70 years

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