PTH and myasthenia gravis: Specifically, serum creatine kinase, serum monoclonal gammopathy, acetylcholine receptor antibody (myasthenia gravis), blood-cell count, basic metabolic panel, C-reactive protein, serum protein immunoelectrophoresis, thyroid function test, parathyroid hormone level, and serologies for human immunodeficiency virus 1 and 2, and B and C hepatitis virus [19,26,27].