Case Report
Rare Cause of Recurrent Hypoglycemia: Insulin Autoimmune Syndrome
Table 1
Laboratory investigation during initial and subsequent follow-up period.
| Lab | Time after the 2nd episode | 1st day | 4th month | 6th month | 12th month | 15th month |
| FPG (mg/dL) | 44 | 96 | 87 | 93 | 92 | HbA1c (%) | 5.7 | 5.7 | 5.8 | 5.7 | 5.8 | Fasting insulin level (µU/mL) | 2628 | 50.77 | 26.11 | 18.17 | 12.62 | C-peptide level (ng/mL) | 8.3 | — | 1.95 | 2.23 | 2.16 | Insulin autoantibody level (nmol/L) | 10.7 | — | — | — | — | Anti-thyroperoxidase Ab (U/mL) | 88.84 | — | 62.10 | 43.35 | 35.11 | Anti-thyroglobulin Ab (U/mL) | 169.26 | — | 114.11 | 68.11 | 72.40 | Antinuclear Ab titer | 1 : 320 | — | 1 : 320 | 1 : 100 | — |
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obtained during the hypoglycemic episode.
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