Tandem Predictive Low Glucose Suspend Inpatient Feasibility Study

Inclusion Criteria: * Diagnosis of type 1 diabetes requiring insulin therapy for at least 12 months * Insulin pump therapy for at least 6 months * Age ≥18.0 years * Subject demonstrates stable insulin regimen including basal rates, insulin sensitivity factor and insulin:carbohydrate ratio for at least 3 months Exclusion Criteria: * Pregnant (female subjects must have negative urine or serum pregnancy screening test) * Severe hypoglycemia resulting in seizure or loss of consciousness in the month prior to enrollment * Diabetic ketoacidosis in the month prior to enrollment * A current condition that would prevent the use of a CGM sensor or insulin pump, or in the judgment of the investigator is a contraindication to study participation * Use of acetaminophen during study participation * Current use of any medication intended to lower glucose other than insulin including naturaceuticals, oral or non-insulin injectable medications