The C-peptide looks at a marker of the body's own insulin production. It is done for: classify diabetes type.
General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
C-peptide is a marker that measures the body's own insulin production. It is typically used to classify diabetes types. The test is done to determine if insulin is being produced by the body or if there is low insulin production, which can indicate type 1 diabetes. The preparation involves fasting, and the results are interpreted by a qualified health worker. If the result is high, it suggests insulin is being produced. If the result is low, it indicates low insulin production, which is more common in type 1 diabetes.
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references
Classify diabetes type.
Often fasting. Laboratory-specific; see the reference range on your report. High or positive may mean: Insulin being produced. Low or negative may mean: Low insulin production (type 1). General information, not a diagnosis. Results must be interpreted by a qualified health worker.
A marker of the body's own insulin production.
Blood
Insulin being produced.
Low insulin production (type 1).
Reference ranges vary by lab, age and sex — always use the range printed on your own report.
Consult a doctor to interpret results — a single test does not make a diagnosis.
Uses your location once to list the nearest facilities. Nothing is stored.
What does the C-peptide measure?
A marker of the body's own insulin production.
Why is the C-peptide done?
Classify diabetes type.
Do I need to fast for the C-peptide?
Often fasting.
What does a high or positive C-peptide mean?
Insulin being produced.
What does a low or negative C-peptide mean?
Low insulin production (type 1).
What is the normal range for the C-peptide?
Laboratory-specific; see the reference range on your report.
Why is C-peptide done?
Classify diabetes type.
Do I need to prepare or fast for C-peptide?
Often fasting. Laboratory-specific; see the reference range on your report. High or positive may mean: Insulin being produced. Low or negative may mean: Low insulin production (type 1). General information, not a diagnosis. Results must be interpreted by a qualified health worker.
SI text CC BY 4.0; decoder reference data (cited per range); LOINC codes free with attribution (notice included).
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references