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Wireless Body Area Networks (WBANs) are playing promising role in healthcare field by allowing remote monitoring of patients. In such networks, designing a energy efficient routing topology is of main concern. For this purpose, we propose CEMob, Critical data transmission in Emergency with Mobility support in WBANs, as a routing layer protocol. CEMob avoid continuous transmission of information, thereby, preserving nodes' energy. Simulation results of CEMob are compared with that of contemporary routing protocols i.e. ATTEMPT and REATTEMPT. Comparison justify that CEMob has reduced energy consumption and is more efficient than the compared protocols.