After special processing, biosensors generate an electronic signal which is converted into a glucose measurement. The results are displayed on the watch-like screen. To use the GlucoWatch, a patient must place a drop of blood into the device. It takes three hours to calibrate the measurement. After that, readings can be taken every 20 minutes for up to 12 hours.
Patients can use the glucose readings to keep tighter control over insulin needs.
The device can be programmed to record certain events during the day, such as eating a meal or exercising. This information can help patients understand how regular activities affect blood sugar levels. If blood sugars get dangerously high or low, an alarm sounds to alert the patient or caregiver. Three months of data can be stored in the GlucoWatch. The information can be downloaded to a computer, printed, or transmitted to a health care provider.