FlowSense, is a wireless, noninvasive thermal flow sensor that can be mounted on a patient’s neck overlying the shunt to detect the presence and magnitude of CSF. Similar in size to a band-aid, it is composed of soft, silicone with no hard edges. Data is wirelessly transmitted to a custom designed mobile app. With FlowSense, monitoring of shunt function can occur in hospitals and the home, obviating the need for imaging and unnecessary hospital visits.