C-peptide test result- what does it mean?

C-Peptide 157,0 pmol/L (330,0-1400,0)

what does this c- peptide test mean? thanks

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How long had it been since eating when you had the blood draw?
(ie - fasting or not?)

I assume you had a Comprehensive Metabolic Panel (CMP) at the same draw? What was the recorded BG on that?

glucose 97 mg/dL tests done fasting.

The obvious comment is to discuss it with your Doctor.
Not being a doctor, I would think these results would make additional testing for the various antibodies associated with T1 to be an appropriate follow-up?

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I found this about the units used in measuring c-peptide:

The reference range of C-peptide is 0.8-3.1 ng/mL (conventional units), or 0.26-1.03 nmol/L (SI).

And I found a site to convert picomoles to nanomoles.

09 AM

So, in SI units using picomoles (pmol), one reference range is from 260-1030 pmol/L. Your lab, however, uses a reference range of 330-1400 pmol/L.

Your reading of 157 pmol/L is low.

I believe this suggests a diagnosis of type 1 diabetes. I am not a doctor and this is a doctor’s call. As @Tim35 said, you will need to discuss this with your doctor.

Marginally low reading with normal fasting glucose level not necessarily relevant, though. Would be a smoking gun if high fasting glucose levels and low c-peptide. Doctor would have to evaluate it in context of her overall history.

Thanks Terry and Tim. I was asking for someone else and i will pass on what you said- the advice is to essentially follow up with antibodies tests.

Thanks, Sam.