C-peptide testing: preserved or high levels indicate which type of diabetes?

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Multiple Choice

C-peptide testing: preserved or high levels indicate which type of diabetes?

Explanation:
C-peptide reflects how much insulin your own pancreas is producing, since it is released in equal amounts with endogenous insulin. In type 1 diabetes, autoimmune destruction of beta cells drastically reduces insulin production, so C-peptide becomes low or undetectable. In type 2 diabetes, insulin resistance prompts the pancreas to keep producing insulin, and often at normal or higher levels, so C-peptide is preserved or elevated. That pattern of preserved or high C-peptide is therefore most consistent with type 2 diabetes rather than type 1 diabetes, gestational diabetes, or prediabetes.

C-peptide reflects how much insulin your own pancreas is producing, since it is released in equal amounts with endogenous insulin. In type 1 diabetes, autoimmune destruction of beta cells drastically reduces insulin production, so C-peptide becomes low or undetectable. In type 2 diabetes, insulin resistance prompts the pancreas to keep producing insulin, and often at normal or higher levels, so C-peptide is preserved or elevated. That pattern of preserved or high C-peptide is therefore most consistent with type 2 diabetes rather than type 1 diabetes, gestational diabetes, or prediabetes.

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