Department of Medicine and Medical Center Hospitals of the University of Pittsburgh, Shadyside Hospital of Pittsburgh, and Department of Anatomy of Indiana UniversityStunting, with increases in serum growth hormone (GH) levels in response to insulin-induced hypoglycemia or to arginine, has been described in children with constitutional growth retardation. 6 , 7, 21, 25, 28, 30, 31 Supported by grants from tbe John A. Hartford Foundation, Inc., the Western Pennsylvania Arthritis Foundation, the Charles A. Locke Educational and Charitable Trust of the Pittsburgh Foundation, and the Department of Health, Education, and Welfare.Received for publication May 8, 1968. Accepted for publication June 18, 1968.Our data indicate that levels of serum GH observed during the intravenous tolbutamide test in such individuals are about the same as those recorded in normal children. Also, the peak GH responses to tolbutamide and to arginine decrease during therapy with a protein anabolie steroid with rela-
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