The Ambulatory Lung Diagnostic Module (ALDM FeNO) is a single-device instrument for measuring Exhaled Nitric Oxide (FeNO) and Forced Spirometry. The systems cloud-based algorithm evaluates the readings and uses the resulting clinical outcome parameters along with patient history data to provide physicians with a physiological interpretation of the results. The algorithm is based on published concepts for interpreting obstructive and restrictive patterns that indicate corresponding limitations. The ALDS is specifically designed for general practitioners. The system fulfills modern requirements for mobility and robustness to efficiently examine many patients per day. The typical duration of an examination is only a few minutes per patient and implements a guided clinical pathway including forced expiratory flows and the fractional concentration of exhaled NO. The opportunity to combine these tests provides a comprehensive and multidimensional evaluation of the lung function.