GH1 and hyperthyroidism: Initial laboratory testing revealed central hyperthyroidism: thyroxine (T4) 11.4 (5.0–11.0 μg/dl), free thyroxine (fT4) 2.1 (0.7–1.8 ng/dl), TSH 2.8 (0.4–5.5 μU/ml), and tri-iodothyronine (T3) 185 (94–170 ng/dl), in addition to hypersomatotropism: insulin-like growth factor 1 (IGF1) 747 (87–267 ng/ml) and GH 1.58 ng/ml (Table 1).