A method for determining proper placement of a sensor pod on a patient comprising: performing a first quality control procedure on a detection device, wherein said detection device comprises a base unit, at least two sensor pods, a computer system implementing appropriate software, and a display; wherein the first quality control procedure generates a tone from a speaker embedded within said base unit and wherein each of said sensor pods measures and compares the measured sound to a predetermined measurement in real-time; wherein a sensor pod is determined to have met quality control if said sound is within 10% of the predicted measurements; performing a second quality control procedure on said sensor pods, wherein said sensor pods measure sounds on a patient; wherein the system, once engage, detects sounds from the sensor pods and compares the detected sounds in real-time to a predicted sound based on the fluid flow vessel; and wherein said method provides for an audio or visual alarm when said sensor pod is not detecting the predicted sounds, indicating an improper location for the sensor pod.