C-Peptide Test: This test measures the level of C-peptide in the blood, which is a byproduct of insulin production. It provides valuable information about how much insulin the pancreas is producing.
Overview: C-peptide levels are often used to evaluate pancreatic function, differentiate between type 1 and type 2 diabetes, and assess insulinomas (insulin-producing tumors). Unlike insulin, C-peptide levels are more stable and provide a clearer picture of insulin production.
Purpose: This test is commonly ordered for individuals with diabetes to help determine the underlying cause of their condition, evaluate insulin production in those with unexplained hypoglycemia, or monitor patients undergoing treatment for insulinomas.
Interpretation: Normal C-peptide levels typically range from 0.5 to 2.0 nanograms per milliliter (ng/mL). Low levels may indicate type 1 diabetes or pancreatic dysfunction, while high levels can suggest insulin resistance or insulinomas.
Procedure: A blood sample is drawn, usually after fasting for at least 8 hours to ensure accurate results. Patients should follow any specific instructions from their healthcare provider regarding medication and dietary restrictions prior to the test.
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