This private neuro-immunology blood test investigates autoimmune myasthenia gravis from a single venous blood sample. The catalogue test price is £225.00 plus a £50 phlebotomy fee, with results available in 5 days.
It is requested for symptoms such as fluctuating drooping eyelids (ptosis), double vision (diplopia), slurred speech or fatigable muscle weakness.
Written by Mr Stephen Lingam. Reviewed by Dr Penny Sheehan (GMC 6056535) on 18/10/2026.
Neurologists and ophthalmologists order this test for fatigable muscle weakness that worsens with activity, especially drooping eyelids, double vision, difficulty swallowing or proximal limb weakness.
Yes. Both acetylcholine receptor autoantibodies and anti-MuSK antibodies are also available as individual tests in our Harley Street catalogue.
No fasting or special preparation is needed.
A small proportion of patients have seronegative myasthenia gravis, so results should always be interpreted by a neurologist alongside nerve conduction or EMG studies.