Table 1.
Initial Evaluation for Sources of Hypoglycemia
| Patient's Serum | Normal Range | |
| Insulin | 2 μU/mL | 0–20 μU/mL |
| Pro Insulin | 2.4 pmol/L | 2.1–26.8 pmol/L |
| C-peptide | 0.6 ng/mL | 1.1–4.6 ng/mL |
| Cortisol | 18 μg/dL | 5–25 μg/dL |
| Chlopropamide | 0 μg/mL | 0 μg/mL |
| Tolazamide | 0 μg/mL | 0 μg/mL |
| Tolbutamine | 0 μg/mL | 0 μg/mL |
| Gyburide | 0 μg/mL | 0 μg/mL |
| Glipizide | 0 μg/mL | 0 μg/mL |
| Acetohexamide | 0 μg/mL | 0 μg/mL |
| IGF Binding Protein-3 | 1180 ng/mL | 1237–2604 ng/mL |
| IGF-I | 40 ng/mL | 90–360 ng/mL |
| IGF-II | 391 ng/mL | 288–736 ng/mL |
IGF = Insulin-like growth factor