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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What does the below blood test indicate?

helo doctor i am a diabetic patient i have been taking treatment for four years and but so far i have not been classified as type1 or type 2 last last when i visited the doctor he asked me to under go battery of tests such as ANTI GAD, Serum P peptide...etc. and but he hast given me any clear insturction regarding the tests. i have gone to take the tests after 12 pm i gave the blood before that i had my breakfast and had my medicine now i hear that the test should be done fasting. my results are C Peptide - 2.8 ng\ml GAD -1.2IU\ml which group do i belong to could you help me
Thu, 6 Aug 2015
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General & Family Physician 's  Response
Hello,

I would like to welcome you to Health Care Magic. I understand your concern.

First of all I would like to explain you what are the tests you performed.
A C-peptide test is a blood test which is carried out to find out how much insulin your body is producing. This may be useful for determining whether you have type 1 or type 2 diabetes or whether you have insulin resistance.
The normal range for a c-peptide test depends from lab to lab, but in the laboratory I work it is: 0.8 to 3.1 nanograms per millilitre (ng/mL).
The test should be performed fasting, without eating and drinking for 8 hours before having this blood test, as you already did.

A GAD test (Glutamic Acid Dehydrogenase antibodies) is a blood test which measures whether the body is producing a type of antibody which destroys its own GAD cells in pancreatic islets, where insulin is produced normally. Presence of these autoantibodies suggests type 1 diabetes. Negative result are considered when the level is 0-5.0 U/ml.

As you also understand from the above explanation, you belong to Type 2 diabetes, since both test results confirm it.

Hope I answered to your question. For further concerns feel free to ask again.


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What does the below blood test indicate?

Hello, I would like to welcome you to Health Care Magic. I understand your concern. First of all I would like to explain you what are the tests you performed. A C-peptide test is a blood test which is carried out to find out how much insulin your body is producing. This may be useful for determining whether you have type 1 or type 2 diabetes or whether you have insulin resistance. The normal range for a c-peptide test depends from lab to lab, but in the laboratory I work it is: 0.8 to 3.1 nanograms per millilitre (ng/mL). The test should be performed fasting, without eating and drinking for 8 hours before having this blood test, as you already did. A GAD test (Glutamic Acid Dehydrogenase antibodies) is a blood test which measures whether the body is producing a type of antibody which destroys its own GAD cells in pancreatic islets, where insulin is produced normally. Presence of these autoantibodies suggests type 1 diabetes. Negative result are considered when the level is 0-5.0 U/ml. As you also understand from the above explanation, you belong to Type 2 diabetes, since both test results confirm it. Hope I answered to your question. For further concerns feel free to ask again.