GH1 and isolated congenital growth hormone deficiency: The 2 overweight patients with isolated IGHD whose GH responses could potentially have been blunted by being overweight, were only mildly overweight and had peak GH values <1μg/L (patient 1: BMI 26 kg/m2, peak GH 0.70 μg/L; patient 2: BMI 28 kg/m2, peak GH 0.26 μg/L).