Are type 1's still producing insulin? C-Peptide Test

I post this little piece of information because I hear a lot that people diagnosed with type 1 are not producing insulin.  This is not necessarily true.  To find out the level of insulin produced by a type 1 there is the C-Peptide test.  The C-Peptides are produced by the body in equal amounts with insulin, and they can be measured, therefore the amount of endogenous (produced internally) insulin can be measured.  Normal values are 0.5 to 2.0 ng/ml (nanograms per millimeter).  One can also get a rough idea whether they still produce insulin or not, knowing their body weight and daily insulin requirements, because the average individual requires a total amount of insulin (that is, endogenous and exogenous) of 1 unit per Kg of body weight per day. 

The C-Peptide test is also used to determine the type of diabetes at diagnosis.  A person whose pancreas produces less or no insulin usually has a lower than normal level of C-Peptide.  On the contrary, a person with type 2 diabetes may have a normal or increased level of C-Peptide.