An ultrathin, inexpensive wearable patch can give doctors detailed information about crucial markers of health.
How much blood is running through your veins, arteries, and capillaries? To find out, you’d typically need to be motionless. Now a new wearable device may soon be able to give you that information even while you’re moving around, doing normal activities. The flexible patch, which conforms to the skin and uses tiny heat sensors to precisely map the blood flow beneath the surface, could give doctors a high-resolution view of this important indicator of health.
