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6%) patients (k = 0.833, p = 0.003) with GST cutoff  1ng/mL. GH peaks on the two tests correlated (r = 0.725, p = 0.008). Fixed-dose (1mg) GST using a peak GH cutoff of  3ng/mL or  1ng/mL promises to be useful for screening for GHD in adults and late adolescents with PWS. However, in those weighing  90kg, the  1ng/mL cutoff seems better. Larger studies are necessary to establish definitive glucagon doses and cutoffs, especially in extremely obese patients.  90 kg, the  less then  1 ng/mL cutoff seems better. Larger