Laboratory Studies
If myasthenia gravis is suspected, check serum acetylcholine receptor antibody levels.[3]
Imaging Studies
The following are indications to perform neuroimaging studies (eg, MRI, CT) of the orbit and brain:
- History not consistent and onset not clear
- Other neurologic findings along with ptosis
- Orbital wall fracture suspected with history of trauma
- Visible or palpable lid mass
- Orbital tumors (eg, lymphoma, leukemia, rhabdomyosarcoma) suspected
- New onset of Horner syndrome with or without other neurologic findings
- New onset of third cranial nerve palsy with or without other neurologic findings
- Globe displacement with either enophthalmos or proptosis
Other Tests
If myasthenia gravis is suspected, the following tests are recommended:
- Single fiber electromyography (EMG)
- Tensilon test
- Ice test
If a mitochondrial disorder is suspected, an ECG is recommended.
Procedures
If a mitochondrial disorder is suspected, a muscle biopsy should be performed.
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