Diabetic peripheral neuropathy is the most likely diagnosis for someone with diabetes who has pain in a leg or foot, although it may also be caused by vitamin B12 deficiency or osteoarthritis.
A glucose tolerance test is recommended for someone with peripheral pain who has not been diagnosed with diabetes.
Neurological tests may show reduced functioning of the peripheral nerves, but seldom correlate with the severity of diabetic peripheral neuropathy and are not appropriate as routine tests for the condition.
Further Reading
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"Diabetic neuropathy"
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