A 12-year-old girl with short stature due to idiopathic Fanconi syndro
me and chronic renal failure was treated with recombinant human growth
hormone (rhGH). Then was no family history of diabetes mellitus and t
he glucose tolerance before treatment was normal. Intravenous glucose
tolerance tests were performed before, during and after treatment. Two
months after starting rhGH the early phase of insulin secretion (1-+3
-min values) was diminished, and the patient developed manifest diabet
es mellitus with hyperglycemia and an elevated hemoglobin Ale. Followi
ng discontinuation of rhGH, glucose tolerance slowly returned to norma
l.