Table 2. Serum concentrations of various factors following a 72-h fasting test performed during the patient’s second hospitalization.

Factor	Concentration
Blood glucose	51 mg/dL
Beta-hydroxybutyrate	23.4 mg/dL (normal, ≤2.8 mg/dL)
C-peptide	0.7 ng/mL (normal, 1.1–4.4 ng/mL)
Proinsulin	<7.5 pmol/L (normal, ≤18.8 pmol/L)
Insulin	2 uIU/mL (normal, 2–25 µIU/mL)
Insulin Ab	< 0.4 U/mL (normal, <0.4 U/mL)
Human growth hormone	0.8 ng/mL (normal, ≤7.9 ng/mL)