With the advancement in technology and availability of less expensive sensors, Wireless Body Area Networks (WBANs) are becoming popular for remote monitoring of the patients’ physiological conditions. To monitor the patients’ health, the data collected from the body sensors should be sent to remote servers or doctors by the coordinator. One of the primary issues with this transmission is the integration of WBAN data with other heterogeneous networks such as WLAN, WiMAX etc. to deliver the data efficiently. The main component responsible for maintaining seamless connection among heterogeneous networks is vertical handover. In this paper, we present a comprehensive survey of vertical handover decision algorithms to satisfy the Quality of Service (QoS) in WBAN applications.