{"id":2092,"date":"2025-07-17T12:05:48","date_gmt":"2025-07-17T12:05:48","guid":{"rendered":"https:\/\/drmohans.com\/lab\/?page_id=2092"},"modified":"2025-08-30T09:17:40","modified_gmt":"2025-08-30T09:17:40","slug":"c-peptide-assay","status":"publish","type":"page","link":"https:\/\/drmohans.com\/lab\/c-peptide-assay\/","title":{"rendered":"C-Peptide Assay"},"content":{"rendered":"\t\t
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C-Peptide Assay (Fasting & Stimulated)<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Fasting And Stimulated<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Understanding how much insulin your body produces is a critical step in diagnosing and managing diabetes effectively. The C-peptide assay\u2014conducted in both fasting and stimulated states\u2014is one of the most reliable tests to measure your pancreas’s insulin-producing ability. It helps differentiate between Type 1 and Type 2 diabetes, detect latent autoimmune diabetes in adults (LADA), and assess beta-cell function, ultimately guiding your treatment plan.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What Is C-Peptide and Why Does It Matter?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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C-peptide is a protein fragment released when proinsulin (the precursor of insulin) is split into insulin and C-peptide. While insulin acts quickly and is used by the body, C-peptide remains longer in the bloodstream, making it a more stable marker for assessing how much insulin your pancreas is producing naturally.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Types of C-Peptide Tests: Fasting vs Stimulated<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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  1. Fasting C-Peptide Test<\/strong><\/li><\/ol>

    This test measures basal insulin secretion\u2014the amount of insulin your pancreas produces without any food stimulus.<\/p>

    • Preparation: 8\u201310 hours of fasting<\/li>
    • Purpose: To evaluate natural insulin production uninfluenced by meals<\/li>
    • Useful For:
      • Diagnosing Type 1 diabetes (very low or absent C-peptide)<\/li>
      • Identifying insulin resistance in Type 2 diabetes (normal or high C-peptide)<\/li>
      • Monitoring insulin production in long-standing diabetes<\/li><\/ul><\/li><\/ul>
        1. Stimulated C-Peptide Test<\/strong><\/li><\/ol>

          This test measures insulin response after food or glucose intake, reflecting post-meal pancreatic function.<\/p>

          • Procedure: A glucose drink or standard meal is given, and blood is drawn 90 minutes later<\/li>
          • Purpose: To observe insulin secretion in real-life conditions<\/li>
          • Useful For:
            • Differentiating Type 1, Type 2, and LADA<\/li>
            • Evaluating whether insulin therapy is still required<\/li>
            • Assessing residual beta-cell function<\/li>
            • Supporting advanced treatment decisions (e.g. GLP-1 agonists vs insulin)<\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              C-Peptide Reference Ranges<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              Test<\/strong><\/th>\nC-Peptide Level<\/th>\nInterpretation<\/th>\n<\/tr>\n<\/thead>\n
              Fasting<\/td>\n0.5 \u2013 2.0 ng\/mL<\/td>\nNormal insulin production<\/td>\n<\/tr>\n
              <\/td>\n< 0.5 ng\/mL<\/td>\nSuggests low insulin (Type 1 diabetes)<\/td>\n<\/tr>\n
              <\/td>\n> 2.0 ng\/mL<\/td>\nMay indicate insulin resistance (Type 2 diabetes)<\/td>\n<\/tr>\n
              Stimulated<\/td>\n1.5 \u2013 5.0 ng\/mL<\/td>\nNormal post-meal insulin response<\/td>\n<\/tr>\n
              <\/td>\n< 1.5 ng\/mL<\/td>\nLow insulin production, possible Type 1 or LADA<\/td>\n<\/tr>\n
              <\/td>\n> 5.0 ng\/mL<\/td>\nElevated levels, often due to obesity or insulin resistance<\/td>\n<\/tr>\n\n<\/tbody>\n<\/table>\nNote:<\/strong> Reference values may vary depending on the lab and glucose intake method used.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              When Should You Consider the C-Peptide Test?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              You may be advised to take a C-peptide assay if:<\/p>

              • Your diabetes type is unclear (e.g., LADA vs Type 2)<\/li>
              • You are not responding to insulin therapy as expected<\/li>
              • Your doctor is planning to switch you from insulin to oral medications<\/li>
              • You need an assessment of remaining beta-cell function<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                Factors to Consider Before the Test<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                For Fasting Test:<\/p>

                • Do not eat or drink anything except water for 8\u201310 hours<\/li>
                • Avoid insulin injections before the test unless advised<\/li><\/ul>

                  For Stimulated Test:<\/p>

                  • A standard glucose drink or carbohydrate-rich meal will be given<\/li>
                  • Blood is drawn after 90 minutes<\/li>
                  • Avoid taking insulin, sulfonylureas, or GLP-1 agonists before the test (unless instructed)<\/li>
                  • Inform your doctor about all current medications<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                    Why the C-Peptide Assay Is Crucial in Diabetes Care<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                    The C-peptide test provides real-time insights into how your pancreas functions, helping your care team:<\/p>

                    • Diagnose the correct type of diabetes<\/li>
                    • Tailor individualised treatment plans<\/li>
                    • Avoid unnecessary insulin therapy<\/li>
                    • Choose between oral drugs, injectables, or combination therapies<\/li>
                    • Predict the progression of the disease<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                      Book Your C-Peptide Assay at Dr. Mohan\u2019s<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                      At Dr. Mohan\u2019s Diabetes Specialities Centre, we offer both fasting and stimulated C-peptide assays as part of our comprehensive diagnostic packages. Our specialists ensure accurate interpretation and personalised advice based on your test results.<\/p>

                      Explore our diagnostic packages
                      Book your C-Peptide Test now<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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