--with her bone and other problems, and with the presence of anti-thyroid peroxidase antibodies, they're looking for autoimmune thyroid conditions in Roxie's case by doing the thryoid scan:

http://www.nlm.nih.gov/medlineplus/e...cle/003829.htm

There is likely a suspicion of systemic metabolic disorder with her gastrointestinal transit situation, so they're also looking into the whole diabetic angle (that's what the C-peptide test is all about--it's a by-product of insulin production, and the higher level implies high insulin production, which would be conssitent with both insulin resistance and that hypoglycemic reading).

My suspicion, though, is that an insulin imbalance might be secondary to the gastrointestinal problems; and given that evidence of autoimmunity, I wonder if this might be a good time to test for celiac again . . .