A system for determining peripheral artery disease comprising: a Doppler transceiver for capturing an audio representation of blood flow through a blood vessel of interest; a waveform converter and processor operationally coupleable with the Doppler transceiver, the waveform converter and processor analyzing the audio representation to determine the presence of peripheral artery disease; and a display operationally coupleable to the waveform converter and processor for providing at least one visual indicia for a user; wherein the Doppler transceiver captures an audio representation of the resultant blood flow waveforms in the vessel of interest, arising from reflections generated by a periphery and a proximal bifurcation; wherein the Doppler transceiver digitizes the audio representation for transmission to the waveform converter and processor; wherein the Doppler transceiver is a continuous wave Doppler transceiver which produces a baseband stereo audio representation of Doppler-shift signals received back from moving blood by quadrature detection preserving directionality of blood flow; wherein the Doppler transceiver digitizes the baseband stereo representation into a digitized version and transmits the digitized version to the waveform converter and processor; wherein the waveform converter and processor receives the digitized version and captures a series of short time samples and provides initial filtering of the samples; wherein the waveform converter and processor converts the short time samples into a frequency domain representation of the baseband stereo audio representation of the Doppler-shift signals; wherein the waveform converter and processor provides spectral analysis of the frequency domain representation to produce a directional sonogram; wherein the waveform converter and processor generates a maximum frequency outline for both forward and reverse blood flow; wherein the waveform converter and processor detects the presence or absence of secondary peaks in the directional sonogram between the forward systolic peak and end diastole for at least one cardiac cycle; wherein the waveform converter and processor filters the detection of the secondary peaks to those which have an amplitude between 5% and 70% of the amplitude of a systolic peak of the cardiac cycle; or wherein the waveform converter and processor filters the detection of the secondary peaks to those which have an amplitude between 2% and 85% of the amplitude of a systolic peak of the cardiac cycle and the waveform converter and processor filters the detection of any reverse flow secondary peaks to those greater than 2/64th of the maximum reverse flow peak. wherein the Doppler transceiver captures an audio representation of the resultant blood flow waveforms in the vessel of interest, arising from reflections generated by a periphery and a proximal bifurcation; wherein the Doppler transceiver digitizes the audio representation for transmission to the waveform converter and processor; wherein the Doppler transceiver is a continuous wave Doppler transceiver which produces a baseband stereo audio representation of Doppler-shift signals received back from moving blood by quadrature detection preserving directionality of blood flow; wherein the Doppler transceiver digitizes the baseband stereo representation into a digitized version and transmits the digitized version to the waveform converter and processor; wherein the waveform converter and processor receives the digitized version and captures a series of short time samples and provides initial filtering of the samples; wherein the waveform converter and processor converts the short time samples into a frequency domain representation of the baseband stereo audio representation of the Doppler-shift signals; wherein the waveform converter and processor provides spectral analysis of the frequency domain representation to produce a directional sonogram; wherein the waveform converter and processor generates a maximum frequency outline for both forward and reverse blood flow; wherein the waveform converter and processor detects the presence or absence of secondary peaks in the directional sonogram between the forward systolic peak and end diastole for at least one cardiac cycle; wherein the waveform converter and processor filters the detection of the secondary peaks to those which have an amplitude between 5% and 70% of the amplitude of a systolic peak of the cardiac cycle; or wherein the waveform converter and processor filters the detection of the secondary peaks to those which have an amplitude between 2% and 85% of the amplitude of a systolic peak of the cardiac cycle and the waveform converter and processor filters the detection of any reverse flow secondary peaks to those greater than 2/64th of the maximum reverse flow peak.