Effectiveness and Safety Study of the DexCom™ G4 Continuous Glucose Monitoring System

This will be a non-randomized, single-armed study conducted in the United States. Following screening, a minimum of 60 to a maximum of 80 subjects at up to 4 clinical sites will be enrolled. All participants will wear the G4 Sensor for one 7-day wear period (~168 hours). A subset of 20-30 subjects will wear two G4 Systems (one of which will be blinded) during the 7-day wear period for the purposes of assessing precision. During home use, subjects will be asked to use the meter provided to them to take fingersticks for calibration and diabetes management. Subjects will also be asked to confirm high and low G4 System glucose alerts/alarms by taking a comparative fingerstick immediately after receiving an alert/alarm.

All subjects will participate in one, 8-hour in-clinic session on Day 1, 4, or 7 of the study to collect accuracy information against a laboratory standard (YSI) and against SMBG. During the in-clinic session, subjects will have venous blood draws for evaluation of the YSI blood glucose measurements. Carbohydrate consumption and insulin dosing may be manipulated during the in-clinic session to ensure a wide range of glucose values. For the duration of this study, subjects will be instructed to use G4 System information as an adjunct to (and not as a replacement for) standard SMBG guidance of diabetes self-management.

Subjects will perform G4 Sensor insertions at the clinic under supervision of study staff. Sensor insertion sites will be examined after removal of the Sensor(s). Study staff will document any irritation and/or Adverse Device Effects.

Inclusion criteria

• Age 18 years or older;
• Have been diagnosed with insulin-requiring diabetes and are on multiple daily injections (MDI) or Continuous Subcutaneous Insulin Infusion (CSII) insulin therapy;
• Willing not to inject insulin or wear an insulin pump insertion set within 3 inches from the Sensor site during Sensor wear;
• Willing to use only the blood glucose meter provided to them for self-monitoring of blood glucose (SMBG) during Sensor wear;
• Willing to participate in one, 8-hour in-clinic session and be willing to take 4 fingersticks per hour and have 4 blood draws per hour for the entire 8-hour duration;
• Willing to take a minimum of 6 fingersticks per day during home use (2 for calibration purposes, 4 for comparative purposes);
• Willing to refrain from the use of acetaminophen during the Sensor insertion period and for at least 24-hours prior to Sensor insertion;
• Willing not to schedule a magnetic resonance (MRI) scan, computed tomography (CT) scan, or x-ray, for the duration of the study;
• Able to speak, read, and write English.

Exclusion criteria

• Have extensive skin changes/diseases that preclude wearing the Sensor on normal skin (e.g. extensive psoriasis, recent burns or severe sunburn, extensive eczema, extensive scarring, extensive tattoos, dermatitis herpetiformis) at the proposed wear sites;
• Subjects who have a known allergy to medical-grade adhesives;
• Are pregnant as demonstrated by a positive pregnancy test within 72 hours of insertion;
• Have a hematocrit that is less than 30%, or greater than 55%;
• Current participation in another investigational study protocol (if a subject has recently completed participation in another drug study, the subject must have completed that study at least 30 days prior to being enrolled in this study);
• Have any condition that, in the opinion of the Investigator, would interfere with their participation in the trial or pose an excessive risk to study staff handling venous blood samples (e.g., known history of hepatitis B or C).