Other names: insulin C-peptide, connecting peptide insulin, proinsulin C-peptide
C-peptide is a substance made in the pancreas, along with insulin.
What is insulin?
Insulin is a hormone that controls the body's glucose (blood sugar) levels. Glucose is your body's main source of energy. If your body doesn't make the right amount of insulin, it may be a sign of diabetes.
Why test for C-peptide?
C-peptide and insulin are released from the pancreas at the same time and in about equal amounts. So a C-peptide test can show how much insulin your body is making. This test can be a good way to measure insulin levels because C-peptide tends to stay in the body longer than insulin.
A low level of C-peptide can mean your body isn't making enough insulin.
It may be a sign of one of the following conditions:
- Type 1 diabetes
- Addison disease, a disorder of the adrenal glands
- Liver disease
It may also be a sign that your diabetes treatment is not working well.
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A high level of C-peptide can mean your body is making too much insulin.
It may be a sign of one of the following conditions:
- Type 2 diabetes
- Insulin resistance, a condition in which the body doesn't respond the right way to insulin. It causes the body to make too much insulin, raising your blood sugar to very high levels.
- Cushing's syndrome, a disorder in which your body makes too much of a hormone called cortisol.
- A tumor of the pancreas
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1,5-Anhydroglucitol (1,5-AG), Intermediate Glycemic Control, 5-Methyltetrahydrofolate, Adiponectin, Albumin/Creatinine Ratio, Random Urine, Anti-Thyroglobulin ab. (0-39), C-Peptide, LC/MS/MS, C-Peptide, Serum, C-Peptide, Ultrasensitive (Endocrine Sciences), Ceruloplasmin, Creatinine, Random Urine, Cyclic AMP, Plasma, Dihydrotestosterone (female), Dihydrotestosterone (male), Estimated Average Glucose (eAG), Free Androgen Index, Free testosterone, Free Testosterone (Male) in pmol/L, Free Testosterone (Male/Serum) in ng/ml, Free Testosterone, Direct (Female), Free Testosterone, Direct (Male), Free Testosterone, Percent (Female), Fructosamine, Glutamic Acid Decarboxylase, Glycated Serum Protein (GSP), Hemoglobin A1c (HbA1c), HOMA-B, HOMA-IR, HOMA-S, Homocysteine, Insulin (Fasting), Insulin Antibody, Insulin Resistance Score, Insulin, Intact, LC/MS/MS, Insulin-Like Growth Factor I (IGF-1), Iodine, Serum/Plasma, Nonesterified Fatty Acids (Free Fatty Acids), Pregnenolone, Proinsulin, Sex Hormone-Binding Globulin (SHBG), T7 Index, Testost., % Free+Weakly Bound, Testost., % Free+Weakly Bound (female), Testost., F+W Bound (female), Testosterone, Testosterone (Female/Child), Testosterone, bioavailable, Testosterone, bioavailable (male), Testosterone, Serum (Female), Thyroglobulin, Thyroglobulin Antibodies (0 - 1 IU/L), Thyrotropin Receptor Ab, Serum, Thyroxine-binding globulin, TBG, TMAO (Trimethylamine N-oxide), Triiodothyronine, Serum, TSH Receptor Antibody (TBII), Zinc Transporter 8 (ZnT8) Antibody