**4. Conclusion**

In this chapter, we reviewed emerging concepts of biosensors based on transistor structures with relevance in the field of easy‐to‐use, portable, and user‐friendly devices for preventive personalized medical applications and point‐of‐care testing. Soaring healthcare costs, trips to the hospital and the stress and pain related to draw blood for testing represent major inconve‐ niences in patients that require being examined regularly, i.e., insulin‐dependent. We believe that the staggering progress done in biosensors based on field‐effect transistors and organic electrochemical transistors represents a major opportunity to empower people globally with medical information in a timely and cost‐effective way.
