SpectRx's device is currently calibrated from a standard meter, but the company is attempting to bypass this need for calibration entirely. MiniMed MiniMed submitted their CGMS device results to the FDA for approval in December, 1997. At this time, readings cannot be directly read from the device, but has to be downloaded into a physician's computer. The design is similar to an insulin pump infusion set, with a sensor inserted through the skin and an external recorder is worn on a belt or elsewhere. After insertion, it must undergo the same calibration step as the GlucoWatch.
Calibration is done twice a day with a standard meter.
This device measures ISF glucose every 5 minutes. If approved by the FDA for direct readout, it will provide quick recognition of blood sugar trends and a complete picture of control. The sensor site must be moved every 2 to 3 days, and site infections may be a problem for some users. Cost of monitoring will be higher than conventional testing but with the convenience of frequent readings. Frequent reporting devices like MiniMed's will allow rapid identification of rising or dropping sugars, and allows identification and correction of problematic blood sugar patterns.