The invention relates to the technical field of expiration detection, in particular to an expiration detection method and device based on passage division of four
metal oxide gas sensors. According to the method, four
metal oxide gas sensor channels are adopted, and a
metabolic energy and substrate switching channel, an
inflammation and
oxidative stress channel, a
volatile organic compound exposure and abnormal metabolic mode channel and a
quality control and stability channel are respectively fixed and correspond to the
metabolic energy and substrate switching channel, the
inflammation and
oxidative stress channel, the
volatile organic compound exposure and abnormal metabolic mode channel and the
quality control and stability channel; an expiration
signal of the same mouth is mapped to response axes of the four channels, and the
system outputs the relative state of each channel instead of a
disease diagnosis conclusion; and the
quality control and stability passage is used for judging the qualification of the expiration sample and whether a detection result is allowed to be output or not. By adopting the method and the corresponding device, the sensors and the physiological risk pathways can be in one-to-one correspondence, binding of a single sensor or a
single substance to a specific
disease is avoided, improvement of
interpretability, expansibility and compliance is facilitated, and the method and the corresponding device are suitable for expiration risk environment assessment and
health screening equipment.