The Ambulatory Lung Diagnostic system's 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 airway limitations. The ALDS is specifically designed for general practitioners and pediatricians in outpatient care. 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 builds on oscillometry, which requires only normal breathing. Spirometry is available as an option, for example if oscillometry data indicate a possible restrictive airway limitation. The opportunity to combine both tests provides a more comprehensive and multidimensional evaluation of a patient's lung function.