Question about C-Peptide test

[CF10]

Mine came back normal, but it was done while fasting. My blood sugar is always normal while fasting. But after eating (and after a GTT) my blood sugar drops like a rock. Does the C-Peptide only reflect insulin at the time of the test taken or is it indicitive of insulin production over time?

[JanSz]

Mine came back normal, but it was done while fasting. My blood sugar is always normal while fasting. But after eating (and after a GTT) my blood sugar drops like a rock. Does the C-Peptide only reflect insulin at the time of the test taken or is it indicitive of insulin production over time?

http://www.labtestsonline.org/unders...tide/test.html

There is a chapter titled:
What does the test result mean?

[CF10]

http://www.labtestsonline.org/unders...tide/test.html

There is a chapter titled:
What does the test result mean?

Doesnt answer my question.