We present an energy harvested ultra-low power transceiver for medical applications. The proposed design is RF-powered and enables bidirectional full-duplex communication using time-division duplexing (TDD) at 1.85GHz. The transceiver achieves a data rate of 7.2Mbps in TX, and 1.8Mbps in RX. The TX consumes 54μW, while the RX consumes 9.4μW of power. The prototype was fabricated in 40nm LP CMOS and occupies 0.8mm².