serum levels of GH, Somatomedin-C as well as linear body growth were determined in 28 young diabetic subjects (14 children and 14 preadolescents) and in 20 normal age-matched control. All children and 50% of the preadolescent patients were poorly controlled. The mean hight in both groups was insignificantly lower than that in controls. Serum GH was higher in both groups while SM-C was insignificantly lower in children and insignificantly higher in preadolescents than that in the controls. An inverse correlation between GPP and SM-C in the poorly controlled preadolescent diabetics. These finding may suggest that the decreased linear growth results in poorly controlled diabetics from decreased serum SM-C. Meanwhile, the elevated GH levels may imply a state of GH resistance and may help to explain the inadequate diabetes control among this group patients.