- Confirmed diagnosis of growth hormone deficiency (if a subject satisfies any one of the three following criteria): a) For the insulin tolerance test (ITT) or glucagon test both performed within the last five years: the validated cut-off for GHD in adults is a peak GH response of below 3.0 ng/mL (3 microg/L), b) For growth hormone releasing hormone (GHRH) +Arginine test performed within the last five years: for those subjects with a body mass index (BMI) below 25 kg/m^2, a peak GH below 11 ng/mL (microg /L); for BMI 25-30 kg/m^2, a peak GH below 8 ng/mL (8 microg/L); for BMI above 30 kg/m^2, a peak GH below 4 ng/mL 341 (4 microg/L ), c) Three or more pituitary hormone deficiencies at screening