Growth hormone stimulatory tests were taken and insulin provocative test revealed a severe GH deficiency in this patient, defined by a peak response to insulin-induced hypoglycemia less than 3ng/dL and IGF1 concentrations less than –2SDS.The values were: GH1 – 0.18ng/mL, GH2 – 0.49ng/mL (after the stimulation with insulin 0,4IU/kg/dose), IGF-1 – 49ng/mL (N :116-356ng/ml). The gene discussed is IGF1; the disease is Hypoglycemia.