Postable Spirometry: User-Assembled Vortex Whistle Spirometer

3D printed vortex whistles have been shown to be an accessible alternative to clinical spirometers, the most common pulmonary function test to assess lung health. While more accessible than the current standard, the question remains of how to get the whistles to users for their own personal use. The novelty of this paper is the proposal and demonstration of our idea of making the vortex whistle out of a postcard so it can be simply mailed to users. This paper demonstrates the potential for a spirometer system to be mass-deployed in the form of a postcard. The results demonstrate that the use of oilboard does not compromise the performance of the device, and can thus serve as a mass-screening tool. As such, we show that Postable Spirometry can serve as a truly ubiquitous pulmonary function testing solution. This work inspires the larger vision that other smartphone accessories or attachments can also be constructed out of paper, creating a fleet of Postables. Postables will enable the wide scale deployment of ubiquitous smartphone accessories. Clinical Relevance— This solution increases the accessibility of pulmonary function testing. As a device sent through the mail, Postable Spirometry can vastly increase screening capabilities in communities without easy access to clinics.