Oura Ring 4

The Oura Ring 4 (Model OA11) represents a significant shift from general wellness toward clinical utility in the wearable space. While many rings offer lifestyle insights, the Oura system is uniquely integrated as a cleared data source for the Natural Cycles fertility application (K202897). Clinical studies involving 40 women demonstrated that the ring's temperature sensors correlate strongly with oral thermometers, allowing it to function as a reliable source for basal body temperature (BBT) monitoring. Beyond fertility, the device employs red and green LEDs for continuous cardiac monitoring and sleep analysis, including heart rate and movement-based sleep staging. Its design prioritizes safety with ISO 10993 compliant skin-contact materials. Technical performance is robust, with memory capacity to store up to two weeks of data between syncs and a wide operating temperature range. However, it is strictly restricted to adult use (18+) and serves as a screening and management tool rather than a standalone diagnostic device.