Abstract:Recognition elements are important parts of biosensor, which are closely related to the selectivity of sensor. Classical recognition elements are isolated from the body of organisms, such as enzymes, antibodies and other recognition elements. The novel recognition elements include synthetic aptamers, molecularly imprinted polymers (MIPs), affinity and other artificial recognition elements. According to the characteristics of different identification elements, a variety of biosensors have been developed for clinical testing. In this paper, the research progress of identification element and its application in clinical testing were reviewed.