No acetylcholine receptor antibody (or less than .05 nmol) in the bloodstream is normal.
Note: nmol = nanomole
Presence of acetylcholinesterase antibody in the blood of persons who have symptoms of myasthenia gravis supports the diagnosis. However, a lack of these antibodies does not rule out this condition. About 10-15% of people with myasthenia gravis do not have signs of this antibody in their blood.