One or more embodiments of the present invention provide a conversion mask that is quick, safe and cost effective and a method for increasing oxygen saturation and/or arresting a subsequent decline in oxygen saturation, which does not unnecessarily increase costs, require a bulky and uncomfortable mask or disrupt the flow of oxygen and/or care being provided to the patient. In one or more embodiments, the conversion mask has a thin, lightweight non latex plastic shield or tent-like mask designed to convert a nasal cannula to a full oxygen capturing mask. The conversion mask serves to capture oxygen escaping from nasal cannula effectively redirecting it back to the mouth and nose, thereby improving oxygenation and/or arresting a decline in oxygenation of patients, particular those under conscious sedation, deep Propofol anesthesia or post general anesthesia, with low oxygen saturation levels until they can be transferred to next level care.
