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CPT Code:
83525, 84681
Test Type: 1 mL Serum
Stability Time:
|
Temperature |
Period |
|---|---|
|
Room temperature |
1 day |
|
Refrigerated |
14 days |
|
Frozen |
14 days |
|
Freeze/thaw cycles |
Stable x3 |
Overview:
Reflects the patient's beta cell function. It, therefore is a marker for endogenous insulin production with or without exogenous insulin injection. C-peptide is not affected by the presence or absence of insulin antibodies.
Collection Details:
Collection Instructions:
This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
Red-top tube or gel-barrier tube.
If a red-top tube is used, transfer separated serum to a plastic transport tube. Avoid hemolysis.
Refrigerate.