What are some classical symptoms of type 1 diabetes mellitus (DM)?

Updated: Oct 08, 2021
  • Author: Romesh Khardori, MD, PhD, FACP; Chief Editor: George T Griffing, MD  more...
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Most patients who present with undiagnosed type 1 DM have the classic symptoms of uncontrolled hyperglycemia, including polyuria, polydipsia, nocturia, fatigue, and weight loss. In these patients, a confirmatory random plasma glucose level of greater than 200 mg/dL is adequate to establish the diagnosis of DM. On occasion, a patient who is ultimately found to have type 1 DM presents with subtle symptoms because of residual insulin secretion.

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