Table 3—

Staging severity of diabetic polyneuropathy

N0: No objective evidence of DN
N1: Asymptomatic polyneuropathy
 N1a: No symptoms or signs but neuropathic test abnormalities
 N1b: Test abnormalities* plus neuropathy impairment on neurological exam
N2: Symptomatic neuropathy
 N2a: Symptoms, signs, and test abnormality
 N2b: N2a plus significant ankle dorsiflexor weakness
N3: Disabling polyneuropathy
  • Adapted from Dyck (21,31).

  • *

    * Nerve conduction, QST, or autonomic test abnormalities.