Investigation for bell’s palsy
The investigation of Bell's palsy is primarily clinical, but a few tests help confirm the diagnosis and rule out other causes. Key points from memory:
- Diagnosis is clinical - based on acute unilateral lower motor neuron (LMN) facial nerve palsy with no identifiable cause
- No routine investigations are required if the presentation is typical
- Imaging (MRI) if atypical features or no recovery by 3 months
- Blood tests to exclude Lyme disease, diabetes, sarcoidosis
- Electrodiagnostic tests (EMG/nerve conduction) for prognosis
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Bell's palsy diagnosis investigation
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