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The following tests can be used to diagnose diabetes:
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urinalysis shows glucose and ketone bodies in the urine, but a blood test is required for diagnosis
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fasting blood glucose is 126 mg/dL or higher
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random (nonfasting) blood glucose exceeds 200 mg/dL (this must be confimed with a fasting test)
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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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