C-peptide, fasting — lab reference
In the reference guideAsk your clinician to read this result with concurrent glucose, kidney function, and exogenous insulin use.
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What’s searchable?Ask your clinician to read this result with concurrent glucose, kidney function, and exogenous insulin use.
Highly preanalytic-sensitive. Fasting, processing, and recent intake matter.
Normal <100; prediabetes 100-125; diabetes ≥126 on confirmatory testing unless unequivocal hyperglycemia.
No universal reference or treatment target. Standardize fasting duration and collection time.
The test method matters. Acute infection, injury, and chronic inflammation may elevate.
Fasting, Gilbert syndrome, hemolysis, and liver disease may alter result.
Fasting, ketogenic diets, illness, and diabetes context materially affect interpretation.
Morning fasting collection is preferred when practical. Day-to-day variation is substantial.
Calculated from iron and TIBC. Fasting and timing improve consistency.
Fasting and supplement abstention improve interpretability.
Fasting, liver function, inflammation, and carrier proteins matter.
Fasting, time of day, inflammation, albumin, and trace-metal collection technique matter.
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