Methods: A clinical, randomized, single blinded, crossover study will be conducted. Eight T1D patients treated with insulin pump are studied on four days. All patients are in good metabolic control (HbA1c < 7.5%), C-peptide negative and with hypoglycemia awareness. On each study day, hypoglycemia is induced with subcutaneously insulin and afterward treated with a single subcutaneous dose of glucagon. The study procedures are identical on all days except from the administered dose of glucagon (day 1: placebo, day 2: 100 ug, day 3: 200 ug, day 4: 300 ug). All patients are blinded for the glucagon dose and carry out the four days in random order.