C-Peptide

C-Peptide is a topic covered in the Davis's Lab & Diagnostic Tests.

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Synonym/Acronym:
Connecting peptide insulin, insulin C-peptide, proinsulin C-peptide.

Rationale
To evaluate hypoglycemia, assess beta cell function, and monitor insulin production.

Patient Preparation
There are no fluid, activity, or medication restrictions unless by medical direction. Instruct the patient to fast for at least 10 hr before specimen collection. Protocols may vary among facilities.

Normal Findings
Method: Immunochemiluminometric assay (ICMA).

AgeConventional UnitsSI Units (Conventional Units × 0.333)
Child0–3.3 ng/mL0–1.1 nmol/L
Adult0.8–3.5 ng/mL0.3–1.2 nmol/L
1-hr response to glucose2.3–11.8 ng/mL0.8–3.9 nmol/L

Critical Findings and Potential Interventions
N/A

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