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C-peptide Test: Levels, Purpose, Procedure, And Results

The C-peptide test is a tool your doctor uses to monitor and treat diabetes . It shows how well your body makes insulin , which moves sugar (or glucose) from your blood into your cells. The test can help your doctor decide whether you need to take insulin to control your condition or to check your dosage if you already take it. Doctors can use the test whether you have type 1 diabetes , when the immune system attacks and destroys cells in the pancreas , or type 2, when your body doesn't use insulin as well it should. Beta cells in your pancreas make insulin. During that process, these cells also release C-peptide. This substance doesn't actually affect your blood sugar . But your doctor can measure the level of it to help her figure out how much insulin youre making. Doctors don't use it to actually diagnose diabetes , but it can give them a reading to help treat it. It can tell the difference between insulin your body has made and insulin that you took. To find out whether you have type 1 or type 2 diabetes When you have type 1 and your doctor needs to know how much insulin your pancreas still makes When you have type 2 diabetes and she needs to measure how much insulin you make Continue reading >>

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Popular Questions

  1. Jennifer72

    Fasting Insulin Level after 12-20 Hour Fast

    Had a fasting insulin blood test done at lab yesterday morning at 8:30 AM. It's the first time I've done it. Was curious. Only cost me like $26 to find out. I already knew I was highly insulin resistant type 2. i.e. I know that 1 unit of regular insulin only covers 2 mg/dL of blood glucose (as a corrective dose).
    I hadn't eaten any solid food before blood test, except for 20 hours earlier. I had coffee about 12 1/2 hours before test.. Nothing after the coffee.
    My Fasting Insulin was 12.9 uIU/ml and my fasting blood glucose was 124 mg/dL. (Normal fasting insulin range is 2.6 to 24.9 according to the blood test sheet).
    My calculated HOMA-IR score is then (12.9*124)/405 = 3.95. A score of 1.0 or less is normal from what I've read -- i.e. not insulin resistant.
    Anyways, since this is the first time I've done this test, I'd appreciate if anyone could chime in and tell me all they can about what I just found out with the test.
    Is there any way to determine how strong my pancreas is with this test? Or should I follow this fasting insulin test with another in a couple days where I drink like 100g of glucose 1 hour before the test? If the fasting insulin level is the same, then my pancreas is doing all it can do when fasting even right?

  2. Nicoletti

    I've never had any type of insulin test and it's never occurred to me to have one. My thought is with the way I eat my blood sugars are decent and that's all I care about.

  3. Jennifer72

    Originally Posted by Nicoletti
    I've never had any type of insulin test and it's never occurred to me to have one. My thought is with the way I eat my blood sugars are decent and that's all I care about. Well I've done everything I can with respect to eating and can't get blood sugar below 110-135 range all day. So I am concerned about it. I am thinking my pancreas might be weakened too much.. but again you've seen the amount of insulin it's putting out. 12.9 .. normal is down to 2.9 .. so I guess it still must be somewhat strong? I'm just highly resistant.

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