Back to Ask the Diabetes Team Ask the Diabetes Team

From Coeburn, Virginia, USA:

I was diagnosed in 1999 with type 2 diabetes. My blood sugar was over 400 mg/dl [22.2 mmol/L]. Later, I was referred to an endocrinologist. My general practitioner (GP) says I have type 2 diabetes. The endocrinologist says I am type 1.5, but he has to say type 1 because of insurance. My fasting C-peptide is 0.4. What type am I? Do I really need insulin? Should I have a two hour postprandial C-peptide?


Your C-peptide is low, similar to a patient with type 1 diabetes. However, the C-peptide is best interpreted in light of the simultaneous glucose level. That being said, some that are diagnosed with a latent form of type 1 diabetes that may actually look like type 2 diabetes at the time of diagnosis. It is over time that beta cell function and insulin secretion is lost to the point that insulin replacement therapy is required. Additional studies that might be helpful include antibody tests, such as anti-GAD AB, anti-insulin AB. The anti-GAD stays elevated the longest and, if positive, would be a marker of type 1 diabetes. If you really have type 1 diabetes, and your C-peptide is low, you need to be on insulin therapy.


Original posting 2 Sep 2004
Posted to Diagnosis and Symptoms


  Back to Ask the Diabetes Team Return to the Top of This Page

Last Updated: Tuesday April 06, 2010 15:09:58
This Internet site provides information of a general nature and is designed for educational purposes only. If you have any concerns about your own health or the health of your child, you should always consult with a physician or other health care professional.

This site is published by T-1 Today, Inc. (d/b/a Children with Diabetes), a 501c3 not-for-profit organization, which is responsible for its contents. Our mission is to provide education and support to families living with type 1 diabetes.
By using this site, you agree to our Terms of Use, Legal Notice, and Privacy Policy.
© Children with Diabetes, Inc. 1995-2018. Comments and Feedback.