Type 1 diabetes
Signs and tests

The following tests can be used to diagnose diabetes:

  • Urinalysis shows glucose and ketone bodies in the urine, but a blood test is required for diagnosis
  • Fasting blood glucose is 126 mg/dL or higher
  • Random (nonfasting) blood glucose exceeds 200 mg/dL (this must be confirmed with a fasting test)
  • Insulin test (low or undetectable level of insulin)
  • C-peptide test (low or undetectable level of the protein C-peptide, a by-product of insulin production)
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Review date: November 28, 2007
Reviewed by: David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. Previously reviewed by Robert Hurd, MD, Professor of Endocrinology, Department of Biology, Xavier University, Cincinnati, OH. Review provided by VeriMed Healthcare Network (2/8/2007).

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