Acetylcholine receptor antibody in patients with myasthenia gravis.

The determination of acetylcholine receptor antibody (AChR Ab) titer by an enzyme-linked immunosorbent assay (ELISA) in patients with myasthenia gravis was introduced. The optimal conditions were determined by chequerboard determination. The specificity was confirmed by inhibition tests. The sensitivity is 9 p mole. The comparison of AChR Ab titers among 49 myasthenic patients, 19 non-myasthenic neurological patients and 20 healthy blood donors has shown that it is a highly sensitive, specific, reproducible, rapid, simple and inexpensive method for determining AChR Ab and that it is highly valuable for the diagnosis of myasthenia gravis.