I was soon drawn to continuous glucose monitors (CGMs). These report blood glucose levels every 5 minutes, thanks to a small radio transmitter attached to a fine sensor wire that runs under the skin (the wire is replaced weekly, the transmitter every six months). Finger checks can’t give you the information that a CGM can, such as the rate of change of glucose levels. This data could be vital, not only to Evan’s immediate care but also his long-term health.