On all patients:
CBC (anemia)
Chem 10 (electrolyte disturbance, hypoglycemia, uremia)
ECG (Ischemia, hypo/hyperkalemia)
Consider:
CK (mypoathies)
ESR
CXR and UA (if infectious symptoms or elderly)
FVC (if evidence of respiratory compromise, i.e. Myasthenia, GBS)
CT head (if focal findings, altered mental status, history of cancer, history of any trauma in patient on anticoagulation)
LP (CNS infection, GBS)
Weakness
Neuromuscular weakness
Extrapyramidal reaction
Upper motor neuron:
Hallucinations
CVA
Numbness
Hemorrhagic stroke