1. A system for determining whether a regional oximetry sensor is properly positioned on a subject, the system comprising: one or more inputs configured for: receiving a first signal representative of an intensity of light at a first detector of the regional oximetry sensor; and receiving a second signal representative of an intensity of light at a second detector of the regional oximetry sensor; and one or more processors configured for: determining a first metric value based on the first signal; determining a second metric value based on the second signal; and determining, based on the first metric value, the second metric value, and a relationship between the first metric and the second metric, whether the regional oximetry sensor is properly positioned on the subject.