What is the role of hemoglobin A1c measurement and fasting plasma glucose testing in the diagnosis of diabetic neuropathy?

Updated: Jan 17, 2020
  • Author: Dianna Quan, MD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Hemoglobin A1c and fasting plasma glucose are important laboratory screening tests for diabetic neuropathy. Hemoglobin A1c measurement is useful to assess the adequacy of recent diabetes control; levels are likely to be elevated in patients with diabetic neuropathies. In some cases, especially with asymmetrical syndromes, the severity of the elevation does not always correlate with the severity of the nerve disease.

A 3-hour glucose tolerance test may be more sensitive in borderline cases. A urinalysis is also helpful to screen for nephropathy and proteinuria.

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