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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5-Methyltetrahydrofolate, Adiponectin, Albumin/Creatinine Ratio, Random Urine, Anti-Thyroglobulin ab. (0-39), 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, Direct (Female), Free Testosterone, Direct (Male), Free Thyroxine, Free Thyroxine Index, Fructosamine, Glutamic Acid Decarboxylase, Glycated Serum Protein (GSP), Hemoglobin A1c (HbA1c), HOMA-B, HOMA-IR, HOMA-S, Homocysteine, Insulin (Fasting), Insulin Antibody, Insulin-Like Growth Factor I (IGF-1), Iodine, Serum/Plasma, Parathyroid Hormone (PTH), Serum, Pregnenolone, Proinsulin, Reverse T3, Serum, Sex Hormone-Binding Globulin (SHBG), T3, Free (Triiodothyronine), T4, Free, T4, Total (Thyroxine), T7 Index, Testost., % Free+Weakly Bound, Testost., % Free+Weakly Bound (female), Testost., F+W Bound (female), Testosterone, Testosterone (Female/Child), Testosterone, bioavailable, Testosterone, Serum (Female), Thyroglobulin, Thyroglobulin Antibodies (0 - 1 IU/L), Thyroid Peroxidase Antibodies (Anti-TPO Ab), Thyroid Stim Immunoglobulin, Thyroid-Stimulating Hormone (TSH), Thyrotropin Receptor Ab, Serum, Thyroxine-binding globulin, TBG, TMAO (Trimethylamine N-oxide), Total T3, Tri iodothyronine (T3) Uptake, Triiodothyronine, Serum, TSH Receptor Antibody (TBII)
