Table 3.

Laboratory investigations in suspected vasculitic neuropathy.

Basic neuropathy screening	Vasculitis suspected
Full blood count	Antinuclear antibodies (ANA)
Erythrocyte sedimentation rate	Antineutrophil cytoplasmic antibodies (ANCA)
C-reactive protein	Extractable nuclear antigens (ENA)
Fasting glucose (2 consecutive days)	Rheumatoid factor
Electrolytes	Anti-CCP antibodies
Renal and liver function	Cryoglobulins
Creatine kinase	HIV serology
Serum protein immunofixation	Urine analysis (microalbuminuria?)
Hepatitis B and C serology	Cerebrospinal fluid analysis
Thyroid function	Angiotensin-converting enzyme
	Soluble interleukin-2 receptor
	Antineuronal antibodies
	Serum complement C3, C4