A device for correlating trend data with respect to a patients weight and lower extremity displacement can identify conditions indicative of congestive heart failure. An imaging mechanism is operable to measure lower extremity displacement over a period of time. An over-time trend analysis of both the patients weight and the lower extremity displacement measurements is performed to determine whether over a particular sample period an increase in a patients lower extremity displacement can be correlated with an increase in the patients weight. When such a correlation does not exist, an alert can be issued of conditions indicative of congestive heart failure.
