Table 1. Relevant lab values.
TSH: Thyroid stimulating hormone; Anti-TPO: Anti-thyroid peroxidase antibody; TSI: Thyroid stimulating immunoglobulin; TBII: Thyrotropin binding inhibiting immunoglobulin
| Laboratory parameter | Initial values | After treatment with levothyroxine | After discontinuation of sugar substitutes | After discontinuation of sugar substitutes and levothyroxine | Reference range |
| TSH (mIU/L) | 12.2 | 1.23- 2.16 | 0.005 | Normal | 0.4-4.5 |
| Free-T4 (ng/dl) | 0.5 | N/A | N/A | N/A | 0.58-1.64 |
| Anti-TPO (IU/ml) | 196 | N/A | N/A | <20 | <35 |
| TSI (%) | N/A | N/A | N/A | 113 | <140 |
| TBII (%) | N/A | N/A | N/A | <6.0 | <16 |