Table 1.

Blood tests performed to investigate known causes of paresthesia or neuropathic injury

System	Blood test
Endocrine:	Fasting glucose and hemoglobin A1C
Infectious disorders:	Syphilis (Treponema pallidum IgG Ab), Lyme (Borrelia burgdorferi)
Nutritional:	B12, methylmalonic acid, folate
Autoimmune disorders:	Antinuclear antibody, antibodies to deamidated gliadin peptide (associated with celiac disease)
Hematologic:	Serum protein electrophoresis with immunofixation
Inflammatory reactions	C-reactive protein
Toxic exposures	Blood lead concentration