Dexcom G4

The Dexcom G4 Platinum is a continuous glucose monitoring device (CGM) including a sensor, transmitter, and receiver. It is typically used by type 1 and type 2 diabetics to monitor blood glucose levels. It was introduced in 2012 and discontinued in June of 2020.

The G4 is considered the first of the "new generation" Dexcom CGMs. Its primary selling point was the 20-foot transmission range, a large step up from the ~5 foot range of its predecessor, the Dexcom Seven Plus.

According to the FDA, the sensor component of the device should be replaced every 7 days, but many users report wearing the sensor with minimal issue for 14-21 days. The transmitter lasts at least six months, requiring replacement after its battery runs out.

During its time officially on the market, prices for the G4 set ranged between $1100 and $1800 for the initial package, and then around $300 for a 3-month supply of the disposable sensors and transmitters.

The G4 receiver resembles an mp3 player, featuring a small screen depicting blood glucose levels and trends on a graph and a round set of five buttons next to it: four directional buttons and a center (select) button. According to the manual, the receiver is roughly 4 inches (10.2 cm) long, 1.8 inches (4.6 cm) wide, and 0.5 inches (1.3 cm) thick.

The sensor is a transparent plastic component that sticks directly to the skin and comes with an applicator. It comes in a sterile, sealed package. When applied, it inserts a cannula under the skin to monitor blood glucose levels. It provides a slot to insert the transmitter into after application.

The transmitter is a small oblong gray device that inserts into the sensor. It has a large "Dexcom G4" logo across the top. It is approximately 1.5 inches (3.8 cm) long, 0.9 inches (2.3 cm) wide, and 0.5 inches (1.3 cm) thick.

Sources:

Dexcom G4 Manual

• Dexcom Official Site
• Wikipedia
• Test Drive - Dexcom G4 Platinum CGM