| C- peptide is a left-over from insulin production (i think it stands for connecting peptitide) so therefore they can estimate your insulin production capability from the levels of c-pep in the blood..
A mole is an amount of a substance that contains a large number (6 followed by 23 zeros) of molecules or atoms. A picomole is one-trillionth of a mole.
I don't know what the normal levels are per se.. I hae been tested twice and each time it was done on a different scale, however the lab had the normal ranges in brackets so I could see where I was on that scale. The first time I was in the middle and told by my endo that I had a marginal amount of insulin, later I was right at the bottom of the scale (albeit a different scale) 270-1270 and I was 299, I went on to insulin a couple of months later..however, I only use it at meals, so I clearly still have enough of my own to run basel..
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edited to say
if c-pep is higher than the normal range this indicates insulin resistence as the pancreas is super producing to try to get the glucose into the cells..If it is low though, it could still be T2 just at a later stage and beta cells dying or worn out. So very low T1 very high T2 as a simple definition.  | 
