Record, process, and analyze respiratory resistance data obtained with the Air Perturbation Device (APD). Information on flow rate, inhalation and exhalation resistance, and expiratory volume from the APD is used to detect respiratory illnesses, such as asthma and paradoxical vocal fold motion, in children and adults. Designed Graphic User Interface and script in MATLAB to regulate the calibration of the APD to the current diagnostic industry standard, IOS. The GUI/script calculates calibration ratios based on resistance values and stores data into an Excel file to document long-term maintenance of each APD.