Dexcom was founded in 1999 by Scott Glenn, John Burd, Lauren Otsuki, Ellen Preston and Bret Megargel.[1][2] In 2006, Dexcom received U.S. Food and Drug Administration (FDA) approval and launched the Dexcom STS Continuous Glucose Monitoring System, which is a three-day sensor that provides up to 288 glucose measurements for every 24 hours. Dexcom received approval of the second generation product, the Seven Continuous Glucose Monitoring System in May 2007. This device improves on accuracy and extending usage from three to seven days.