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.
