Secretion of insulin in a group of children with normal stature and without endocrine-metabolic (47 cases), versus another group with constitutional short stature (35 cases). Is study authors made a glucose tolerance test (1 g/kg) to both groups and they study the fisiologic secretion of insulin during 24 hours. It was observed that rates of insulin were similar after glucose tolerance test in both groups, but study of fisiologic secretion of insulin during 24 hours shows low rates of insulin in the group of constitutional short stature (p less than 0.005). The problem group rises higher rates of insulin after a glucose tolerance test than after the study of fisiologic secretion of insulin in 24 hours, but the other group shows similar answer in both tests.