C-Peptide, Seven Specimens
Use
The C-Peptide, Seven Specimens test is primarily used to assess insulin production in patients. It involves the collection of an initial blood sample followed by several samples after the administration of a specified treatment or drug, such as glucola or a medication, to evaluate changes in serum C-peptide levels over time. This series of measurements can help in understanding how a patient's body is responding to a treatment regimen or in diagnosing certain conditions such as insulinomas or distinguishing different types of diabetes.
Special Instructions
This test requires multiple tubes to be drawn at different time points, usually in conjunction with the administration of a drug or treatment like glucola. Patients scheduled for this test must be assessed for biotin supplementation, which can interfere with test results. It is advised that patients stop consuming biotin at least 72 hours before specimen collection. Clinicians should be contacted to confirm the necessity of a series collection prior to testing.
Limitations
Samples may show interference if collected from patients taking high doses of biotin supplements. Additional confirmatory or reflex testing may affect the turnaround time. This test should not be administered unless a treatment (pill, shot, or glucola) is given following the baseline sample. The reference interval applies to fasting patients only.
Methodology
Immunoassay (CLIA)
Biomarkers
LOINC Codes
- 57376-6
- 46963-5
- 13034-4
- 13035-1
- 13036-9
- 16501-9
- 13032-8
- 13033-6
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Whole Blood
Volume
Not provided
Minimum Volume
Not provided
Collection Instructions
Multiple tubes are required, with initial and subsequent collections tied to specific time points following treatment.
Patient Preparation
Patients should abstain from biotin supplements for at least 72 hours before sample collection.
Causes for Rejection
Samples from patients consuming high-dose biotin supplements.