Concomitant central hypothyroidism [thyroid-stimulating hormone (TSH) 7.0 mU/L (n.v. 0.4-4), freeT3 2.1 pg/ml (n.v. 2.6-4.4), freeT4 0.65 ng/dl (n.v. 0.9-1.7)], growth hormone (GH) deficiency [peak GH of 1.3 ng/ml after combined stimulation with GHRH 1 μg/kg body weight + arginine 30 g; insulin-like growth factor 1 (IGF1) 25 ng/ml (n.v. 117–252)] and mild hyperprolactinemia (34 ng/ml; n.v. < 20) were diagnosed. The gene discussed is GH1; the disease is hyperprolactinemia.