“…Four of the included studies (25%) examined the use of pulse oximeters as a tool to increase availability of care through pairing with a smartphone application [17] , [18] , [19] , [20] . Other applications included: as a diagnostic tool for children with pneumonia [15] , [16] ; a monitoring tool in paediatric telehomecare [11] ; remote risk-based monitoring tool for patients at risk of Cardiovascular disease (CVD) [8] , [10] ; a general monitoring tool for blood oxygenation levels [21] , [22] ; post-operative continuous vital sign monitoring for patients recovering from surgery [14] ; data capture and transmission to streamline clinical trials [9] ; long-term oxygen therapy (LTOT) optimization [12] ; and as a digital health intervention for managing Chronic Obstructive Pulmonary Disease (COPD) patients, either as a diagnostic tool or during rehabilitation [4] , [13] .…”