An outpatient ambulatory patient worn apparatus for managing chronic lung disease includes a plurality of sensors configured to be worn by a patient and to measure a plurality of physiological data. The plurality of sensors includes at least an oximeter, a respiratory rate sensor, and at least one activity or motion sensor. A central monitoring unit (CMU) is worn by the patient in an outpatient setting during activities of daily living. The CMU categorizes each recorded measurement of each of the plurality of sensors stored in a set of time stamped primary data by a predominate activity type to generate a set of activity type stamped data, the predominate activity types include rest, exertion, and sleep. A generate report process provides at least one or more reports. An outpatient ambulatory patient worn long-term oxygen therapy (LTOT) apparatus and a method for managing chronic lung disease are also described.
