An automated screening tool for the exclusion of deep venous thrombosis generally comprises a sensor array for gathering thermal data from the lower limbs of a patient suspected of DVT; a processor for automated analysis of the gathered data; and a display device for reporting the exclusion or non-exclusion of DVT. In the preferred embodiment of the present invention, a microprocessor based system is utilized to control the gathering of thermal data and, thereafter, the reporting of the gathered data to the processor. According to the preferred method for use of the present invention, the gathered thermal data is utilized, alone or in combination with other indicators, as a factor for exclusion of DVT based upon an implemented algorithm. According to the preferred embodiment of the present invention, a neural network or genetic algorithm is implemented within the processor in order to make an entirely objective determination relative the presence of DVT. This feature makes the present invention particularly adapted to multiple risk factor analysis, wherein factors such as calf circumference; positive Homan sign; colorimetry reading of the limbs; recent surgery or trauma; history of DVT, phlebitic syndrome or venous insufficiency; or presently uncannulated veins may be considered along with thermographic data.